Huge, huge, huge article in PS3 Magazine, I'll link to some scans. The biggest deal is that one of the pages specifically states that Kaiden/Ashley are squadmates, as are Garrus and Liara. Not just cameos, but squadmates. They also show an image with the new squaddie James Sanders, and it's a still of the guy with the sniper rifle from the London trailer (I thought Bioware had already debunked this?).
http://lo-ping.org/2011/04/21/mass-e...admate-reveal/