Dunno if this has been brought up yet but I have an interesting theory/ question.
Will Sora begin the game with access to his drive forms from previous games?
So far we haven't seen anything about previous drive forms but we do know the ability to use drive forms is 100% confirmed duh...
So as we can see in the screen shot Donald and goof aren't in the hud (assuming it takes both members to activate guard form or maybe just goof but who knows).
We also know that Olympus is the first "world" in kh3 and he's already shown using 2 drive forms in screen shots from this world.
Side note I really like that sora's icon in the hud changes while in drive from still (look at the color of his hood in the img).
I'm pretty convinced these Drive forms are meant to replace the ones in KH2. Sora is on a quest to regain his full power since he lost quite a bit of it thanks to Xehanort's meddling in KH3D.