First off thought I'd make a thread to (hopefully) compile as much ME3 info into one spot. Not going to copy paste or retype a bunch of stuff just going to semi-link dump here. Im also going to (maybe, sometime soon) go back over to the archeived ME2 forums
and see what might be useful from there to throw in here as well more than the quick skim I already did.
Confirmed Features Thread from the BSN there shouldnt be any story spoilers within this link as the thread creator moved them to a seperate page of the site (as part of the group he created to post pics in). if by some backwards logic you want to spoil something (or take the chance of it) click here. otherwise don't click it . and like I said this is via the BSN forums and thanks to Phaedon.
Some screen shots curteous Phaedon's Feature Thread.
Xbox World artilce that is evidentally (and I quote) ULTRA SPOILERIFIC so click at own risk (I haven't read it and wont). via the BSN forums by Vertigo_1.
Casey Hudson's twitter feed He posts up a good bit of info on here not a bad thing to check out. Got this thanks to javierabegazo in his thread on the subject over at the BSN forums.
Game Informer Mass Effect 3 Hub no real spoilers that I can remember and some good info within it. the podcast at the end has a lot of good stuff so don't let the duration deter you if you haven't been keeping up with things.
X360A article on some gameplay stuff (thanks hellhog via the good forums)
Mass Effect Wiki never know when that might be helpful
ME.com news and blog entries are on the lower left (just above the DA:O ad) and are interesting reads from time to time and also you can sign up for their newsletter there as well. and then theres also the facebook feed on the lower right (where I just noticed a new Tali T-shirt that I wish I could buy but 30$ for a single shirt is a bit much)
And because its just to good an article to let die (even though not specificly related to ME3 or ME for that matter, and this is also thanks to HellHog via good forums).
ME2 forum from the good forums for refference (since I know some people may know where some good stuff in there may be that I wouldn't. and just because its the better forum).
These should help you catch up on things and keep you up to date (Phaedon updates that thread near daily here recently and in a little less than a month probalby hourly for a few days straight) .