According to epguides.com, SYTYCD will debut on Thursday May 27th.
So we know seven of the 10 all-stars...
Ade (season 5 - Contemporary and Classical)
Allison (season 2 – Contemporary Jazz)
Comfort (season 4 – Hip-Hop)
Kathryn (season 6 - Jazz, Contemporary, Broadway and Cultural)
Lauren (season 3 - Comtemporary)
Pasha (season 3 - Standard and Latin Ballroom)
Twitch (season 4 - Pop/Lock, Krump)
While collecting the above info, I saw links to a "scandal" about Ade, which might have happened while he was filming his season. Nude pics, or something? I didn't want to hunt through all the links to get concrete info...hadn't heard anything about any contestant on this show being in a scandal. Or am I out of the loop?
Found this, too (no scandal): Comfort recently performed as a reform school girl in the "Bootylicious" number in the "Hairography" episode of the television show Glee.