Apparently, Shangela is also in All Stars 2, which would make 16 queens, but I don't think that's true (3 members of the Alyssa Edwards' drag family in one season is a bit OTT).
Unlike All Stars 1, the queens are not going to be paired up this season. There will, however, still be two queens eliminated each episode. This is what I have gathered based on that info...
1) 3 queens are in the bottom for each challenge and lip sync, with 2 of them going home; or
2) One queen is eliminated on the runway, with 2 queens then needing to lip sync to save themselves.
These are just rumours but they seem legit from what I have read and what people have followed up online...