While I actually have said many times 2012 would be the start of the next generation, your proof is actually more logical if they came out in late 2013 or 2014 as a dev device like this would be used ot build the next games.
However, it could come out as they launch and be utilized on games releasing after launch. Guess we'll see by 2011's E3 if anything new is coming in 2012.