Okay so it turns out it looks like International All Stars
is a thing, and queens are disappearing off social media so it may be filming right now

UKS3 has just finished filming, and I would assume Australia has finished filming too.
The Eurovision-style show is something completely separate from this, and it would appear that the following queens are "Likely" (according to the Spoiler reddit. Link here:
https://www.reddit.com/r/SpoiledDrag...ours_thread_1/ )... so obviously don't click this spoiler if you don't want to know who's appearing:
Spoiler:
From the UK: Blu Hydrangea, Baga Chipz and Cheryl Hole
From the USA: Manila Luzon, Monique Heart (c'mon the real AS4 winners!)
From the Netherlands: Envy Peru, Janey Jacke
From Thailand: Pangina Heals
From Canada: Jimbo, Lemon
So a cast of 10... unless some of these are cameo appearances.
Manila to lose a fourth time?

Unlikely with this cast...