SO..IN AN INTERVIEW KEVIN FIEGE WAS ASKED WHEN GUARDIANS 2 START FILMING AND HE ANSWERED THIS ;
“We start shooting Guardians of the Galaxy Volume 2 in February-March 2016.”
At the end of the interview, Feige was asked if he had just revealed the film’s title, but he would n to confirm anything.
I think that this could be the real title of GOTG since it really fits into the nostalgia tone marvel is trying to fit into the film ..and volume 2 is often used in comics
Also this matches with the cassete tape star-lords' mother gave to him in the film .