vanswarpedtour:

• RUMORED: All Time Low (Source)

The rest are confirmed:

• Sleeping With Sirens (They confirmed it on a stickam chat)
• You Me At Six (They confirmed it in person during The Noise Tour)
• Breathe Carolina (Source)
• Tonight Alive (Source)
• Blessthefall (Source)
• Pierce The Veil (Source)
• Forever The Sickest Kids (Source)
• Of Mice & Men (Source)

(via thefifthjawn)