Guest Stars

Jennifer Lopez and Susan Boyle are in talks about appearing on the show. Neither is confirmed.

John Stamos will play Emma’s dentist boyfriend Carl Howell. No word on how many episodes he will appear in.

Jonathan Groff will more than likely come back, but noting is set yet.

Charice will play a foreign exchange student with a golden voice in the second season. No confirmation as to whether this is a guest role or a permanent one.

Music

One episode will feature all original music. (source)
Diane Warren is writing two ballads for this episode.

There will be two artist tribute episodes, one in the fall and one in the spring.

The premiere episode will supposedly have the following songs:
1) Tubthumping by New Directions
2) Goodbye My Lover by Puck
3) Open Your Eyes To Love by Fin and Rachel
4) Come Back To Me by Will
5) Don’t Stop Me Now by New Directions

New Characters

Kurt gets a boyfriend and becomes a power couple in season two. (source)
Kurt’s boyfriend will be on the football team. (source)
He will also be in New Directions. (source)
He will be a “regular dude” who struggles with his sexuality.

Rachel gets some competition from a backstabbing freshman in season two. (source) She’s a devout Christian who will oppose some of the song choices the club makes.

The third character will be an R&B singing teen, someone Ryan Murphy calls “a male Mercedes.” (source)