If the XBONEX entire SOC had a TDP of around 150W, and the 3600G is rumored to be around 100W, I wonder if they wouldn't go a bit higher.

XBONEX had around 40 Compute Units, and assume there isn't a radical change in Stream Processor allocation, 3600g is rumored to only have 20CU, so unless it's somehow a 2x speed upgrade, the performance might not be there.

Mainstream Navi parts seem to be targeting 40CU (again, if we trust the rumors) so I'd assume any next gen systems would probably fall in line with that. With improvements in clockspeed, and architecture efficiency, those 40CU could provide a decent boost from XBONEX.

So I'd guess maybe a custom 3600g, where the CPU's stay mostly the same, but they beef up the GPU with more CU. If they can get 20 more CU in for 50W more TDP I'd say that seems reasonable.

Early hardware speculations is always fun ;)