from watching the trailer and extrapolating, I assume. they're usually pretty formulaic in how they demonstrate new characters' moves.
This. Plus, those would be the moves I'd use for Cloud's B commands given that Limit Breaks and choice of weapon were basically the only mechanical things distinguishing one FFVII character from another. :V With that set up, the only thing Cloud is missing is Meteor Rain (and Cherry Blossom for you FFT aficionados), and I didn't spot that at all during the announcement trailer. The rest of his moveset might either be based upon his various attack animations from using different Materia (like Deathblow, Quadra Slice, Long-Range, etc), or on his Dissidia moveset, I have to rewatch the trailer to be sure (and maybe a Dissidia LP).