Perhaps its time to start discussing and putting forward sites worthy of our original Top Missing list? This time next year, after the WHC we can vote! (5 years from our original vote) I adhered to Els original rules, which provides a useful summary. I chose 3 tentative sites outside my own country.

Full name of site: Sudd Wetland
Country: South Sudan
Short description of site: One of the largest freshwater ecosystems in the world. The Sudd wetland falls within the "Sudd-Sahelian Flooded Grasslands and Savannas" WWF Global 200 eco-region. It is internationally recognised for its unique ecological attributes that include various endangered mammalian species, antelope migrations, millions of Palaearctic migratory birds and large fish populations.
Criteria: Mixed
Outstanding universal value / comparative analysis: Okavango Delta in Botswana and the Pantanal Conservation Area in Brazil, Bolivia and Paraguay

Full name of site: Boma-Badingilo Migratory Landscape (Contiguous site)
Country: South Sudan
Short description of site: The landscape falls across the "Sudd-Sahelian Flooded Grasslands and Savannahs" and "East Sudanian Savannahs" WWF Global 200 eco-regions. Its defining characteristic is the annual white-eared kob migration, a natural spectacle of approximately 1 million animals moving in mega-herds, consisting of thousands of individuals, between Boma and Badingilo National Parks. This is the second largest animal migration in the world.
Criteria: Natural
Outstanding universal value / comparative analysis: Serengeti National Park in Tanzania and the Maasai Mara National Reserve in Kenya.

Full name of site: Benguela Current Marine Ecosystem Sites
Country: Namibia
Short description of site: The Benguela Marine ecosystem is one of the most productive coastal upwelling zones in the global oceans, of which an area offshore southern Namibia is known as the most concentrated and intense upwelling regime in the world. The high levels of primary productivity of this ecosystem support an important global reservoir of biodiversity and biomass of zooplankton, fish, sea birds and marine mammals.
Criteria: Mixed
Outstanding universal value / comparative analysis: Canary Current (offshore Northwest Africa), the California Current (offshore California and Oregon) and the Humboldt Current (offshore Peru and Chile).

Inscribed - Top Missing 2014
3 Ephesus
4 Okavango Delta
10 Silk Roads
16 Ur
28 Major Buildings of Le Corbusier
36 Nan Madol
44 The Grand Canal
49 The Archaeological Site of Göbeklitepe
50 Qhapaq Ñan
65 Cave Chauvet - Pont d'Arc
84 Speicherstadt and Chilehaus with Kontorhaus District
96 Kangchendzonga National Park

Top Missing Nominations (WHC - 2019)
1 Bagan
18 Major Buildings of Frank Lloyd Wright
21 Plain of Jars
32 The Sacred Complex of Babylon

In my original vote, which was limited to 20, I chose several sites above. I assume other users have a similar experience, in which several of their votes are now sites that are inscribed (or perhaps will be in 2019). I look forward to seeing even more users and community expertise in determining an updated Top Missing list.

I like this idea and it is a chance to reevaluate and explore new areas. I'm ruminating on a few ideas and hopefully can come back with some suggestions in the near future.

I would rather favor having a voting button for each tentative site: Inscribe y/n. Then we can compute yet another wilson score and do an ordered, dynamic list. This obviously will not allow for sites that aren't tentative sites yet to be rated (e.g. santorini, cambridge/oxford, colonial hanoi, ...)

I like the button better, just a few questions.

We can thus vote for all sites we want or still only 3?
Can you handle a site being withdrawn and readded without losing the voting info?
What if the site is transnational? It seems each country has a listing for it. You can probably merge the results with rules?

The non-tentative sites could be their own list in the old way if there is enough demand for voting.

Are we going for a new top 50 missing in 2019?

Yeah. Would be good but needs some preparation. So maybe somewhere in Q1?

Q1?

First quarter of the year, maybe March for a final vote?

Maybe first part of the year for nominations, and do a definitive vote after the 2019 Session, so those are not included in the list (thinking of Plain of Jars, which will be in the Missing List and probably be declared World Heritage)?

Sounds good.

Full name of site: Toro Muerto Petroglyphs
Country: Peru
Short description of site: Hidden within this arid landscape are some of the greatest examples of rock art in the world. An estimated five thousand pieces of volcanic tuff depict animal, human and geometric figures likely to have been carved between 500 and 1300 B.C. A menagerie of animals such as condors, foxes, alpacas, snakes, and fish mingle with geometric shapes and dancing figures on stone that, after centuries, remain intact.
Criteria: Cultural
Outstanding universal value / comparative analysis: El Fuerte de Samaipata in Bolivia and Petroglyphs within the Archaeological Landscape of Tamgaly in Kazakhstan.

Full name of site: Baekdudaegan Range: Mt. Geumgang and Mt. Seorak
Country: Korea (Joint nomination)
Short description of site: Over 2,000 animal species live in Seoraksan, including the Korea goral and Musk deer. There are also more than 1,400 rare plant species, such as the Edelweiss. Including its main peak, Daecheongbong, Seoraksan has a total of 30 imposing peaks spread across its territory such as Hwachaebong, Hangyeryeong, and Madeungryeong. Mount Kumgang is a forest-oriented ecosystem linked to coastal, agricultural and freshwater ecosystems. It is home to many endemic and rare species of global significance. The coastal area and natural lakes form the habitats of migratory birds that use the East Asia-Australasian Migratory Pathway. Taebong city in the DMZ is an important historical resource that served as the capital of Goguryeo for eighteen years from 901 to the present day, which was built by the Gurye period in the last three years. The city has high historical and cultural value.
Criteria: Mixed
Outstanding universal value / comparative analysis: Great Smoky Mountains National Park (USA) and Vertical Vegetation Landscape and Volcanic Landscape in Changbai Mountain (China)

I thought this would be automated based on votes for the tentative lists.

That can certainly be done, but what about sites that are on no tentative list?

I would treat those as a wishlist instead. How many would be really not listed as tentative already and actually get a second vote. More than ten? I mean, why reduce the automatic version to manual for it. This is of course assuming there is still a plan for an automatic approach.