As sexypeanut said, none are "confirmed". However I'm sure that we'll definitely get Dalia and Annie scenes. As for the remaining 2: probably Nancy, seeing as her last scene was in 0.5 and maybe Calypso, since she's a de facto LI and her last (and only) scene was in 0.6. Highly doubt we'll be seeing Luna/Penny/Nova (since they just had scenes in 0.7) or Alex for that matter, because even though her last scene was in 0.6 it was the first scene of the insane quality/animation count that we're getting nowadays, so there's really no point for her to have a scene again in 0.8. But then again, Cari said he doubts anyone will be able to guess all the scenes for 0.8, so anything is possible.