For me anyway, the more information that comes out on XII as it's in production, the better. I find being spoiled and trying to root through rumors for what is and isn't true entertaining in and of itself.
I did this with (what turned out to be) First Contact. It was 15 years ago, but I think there were various rumours of massive rag-tag fleets hiding in nebulas after Earth's destruction, and the impression I think I had, at one time certainly, was no time travel at all, for most of the build up anyway. Saw the film several times at the cinema (I was a teenager), including (the first?) showing at the Odeon Manchester, which was preceeded by some guys in Klingon makeup and battle gear fighting in front of the screen. I later saw it twice on one day, so the buildup didn't spoil it for me.
2 years later, with the 9th movie, I stayed clear away from anything to spoil my enjoyment of it. If the film is good, you'll enjoy it a lot. If the film isn't good, you wont. For what it's worth I've seen the new film 4 times now, twice at the cinema, twice on DVD over xmas (3 day gap) - I have a life now though, in the 90's I spent most my waking life on trek-related stuff online (over a modem, at 1p/minute)