Boss Kevin Lyman responded to rumors about the stages changing by saying: 

'Yes, we will have one main stage this year and, yes, we will have all the other stages as well.'

The following bands have been confirmed:

3OH!3 
A Day to Remember
A Skylit Drive
Alexisonfire
Anti-Flag
Bad Religion
Bayside
Big D and the Kids Table
Black Tide
Bouncing Souls
Breathe Carolina
Brokencyde
Cash Cash
Chiodos
Dance Gavin Dance
Dear and the Headlights
Dirty Heads
Escape the Fate
Every Avenue
Flogging Molly
Gallows
Hit the Lights
I Set My Friends on Fire
Jeffree Star
Less Than Jake
Lights
Meg & Dia
Millionaires
NOFX
Outernational
P.O.S.
Saosin
Scary Kids Scaring Kids
Senses Fail
Shad
Silverstein
Sing it Loud
Streetlight Manifesto
Tat
The A.K.A.s
The Architects
The Ataris
The Devil Wears Prada
The Maine
The White Tie Affair
There For Tomorrow
Therefore I Am
Thrice
TV/TV
Underoath
Valencia
Westbound Train 

For more details visit the official here.