There were stories from November claiming Sony sent out dev kits with 16GB RAM alongside one with 8GB, and EDGE said last month they would bump PS4's RAM up to 8GB if they could. 2 sources on 2 occasions and 95% of tech-GAF chose not to believe them. The point I'm making though is the information had been out there.
Maybe (hopefully) Microsoft is a fortress and we're not getting all of the info. I hope so, because the thought of this gen being held back slightly (publishers will cater to the lowest common denominator) to cater to cable companies etc is a little frustrating.
Well the CPU spec bump leaked out to bgassassin.
And then there's this:
"Further Xbox 720 media leaks unlikely; Microsoft operates like a damn mafia"
http://www.neogaf.com/forum/showthread.php?t=508412
We are reading leaks from early 2012, so that statement does hold credence.