They've only been at the TDP disadvantage since Intel's shrink to 32nm- their Pineview Atoms were both hotter and slower. Their Cedarview Atoms are merely slower. 😉 Given that Ontario is on the 40nm node, it's still doing very nicely against Atom. (And that TDP will only be hit under full load; I'm not sure how power draw until normal workloads compares.)
Temash should be interesting- AMD finally get that 28nm shrink they need, they integrated the FCH for further power savings, they get GCN graphics to make GPGPU offloading work better (hopefully a full HSA design), the cores clock faster and have more execution resources. (Floating point vectors go from 64 to 128 bit, which should make a serious difference in float-vector heavy applications like games.) They just need to ship the damn thing!