It does indeed depend what's in those 9 minutes.
Presumably material designed to show off the film, generate interest and buzz and yet also not reveal anything they don't wish to reveal by releasing 9 minutes of it.
I would assume (maybe wrongly) that Abrams won't allow anything out he doesn't want out at this time but that depends whether he gets over-ridden by the studio wanting to make an impact.
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist