This "update" hasn't been "confirmed" anywhere, as I was reading about it a few days ago on 1up.com. The only contact people had with an official Microsoft employee was some jackass moderator on the
www.xbox.fcom forums (If you read his posts, you will realize why he is a jackass...)
So please, if anyone gets this, or notices anything different, post because I'm curious, but not getting my hopes up.