I can't seem to find this repeated elsewhere yet, but it's apparently quoted from AMD themselves: http://wccftech.com/breaking-amds-ge...zen-debut-k12/
Some snippets about the x86 K12 sister core, now 'confirmed' as Zen. The fact they mention it relative to Bulldozer is also somewhat reassuring IMO, implying it will be a 'big' core.
In other news, Centaur have restarted the flippin' timer: http://centtech.com/