I know those Glee spoilers are too good to be true but...
From some guys Tumblr:
2 x 19 RUMORED SPOILERS
I can’t give you guys a source but these are some things I heard.
Howard Bamboo makes a reappearance, but he’s apparently become a lot more confident since last we saw him.
Kurt and Puck become closer, perhaps too close for Blaine’s liking.
Mercedes gets a new love interest.
Burt and Carole experience some strain on their relationship.
Burt and Carole sing ABBA’s “SOS”.
Kurt, Puck, Blaine, Karofsky, Santana, and Brittney sing song, but I haven’t heard what it is yet.
Mercedes sings Bette Midler’s “I’m Beautiful”.
I'll just sit here, crying, pretending they are real. That song could only be Born This Way and Puck is pan and Puckurt is canon and Karofsky gets redeemed and Burt sings and... such beauty, bbs, such beauty!