Couple of songs from twitter that have popped up along with a little tidbit:
For the tl;dr folk:
Episode six: Lea, Dianna, Heather, and Naya will blow you away.
-their outfits and dance moves to a certain Bon jovi song are just wow.
-all I can say is it was a Bon jovi song :)
-All girls number also featuring Jenna and Amber.
Episode seven: Puck and Artie sing "One Love" by Bob Marley. Puck will take people's lunch money. Darren Criss and his crew will sing the Katy Perry song "Teenage Dream" to Kurt.
Guesses for the BJ song?
EDIT: Ryan Murphy said there would be an episode coming up where the girls do numbers by boy bands and the guys do numbers by girl bands... think this is it?