Originally Posted by cherokeesam
The only characters officially listed for GOTG so far are Star-Lord, Drax, Gamora, Rocket, and Groot. When pressed about Warlock/Magus (as well as other Guardians) on several occasions, Feige and others have demurred.
In other words: if Warlock wasn't officially listed as part of the cast in the first place, then believing Marvel/Gunn will change their minds about it later is just wish magic.
Or Warlock will be a surprise for the fans. Marvel's big on surprises in their movies if you don't know by now.