AMD Ontario APU pictured,die size ~77mm^2

[kl0012]

If it's faster than Atom? There is no "if",only how big the gap will be. And Core based Pentiums,IMO, is not Westmere+IGP but Penryn based ULV platform. This is in line with "90% of mainstream performance in half the die area" statement AMD made for Bobcat cores(not the whole Ontario APU). 90% of mainstream is 90% of Propus/Regor which pretty much equals Penryn 3M.

You made to many assumption here. Based on what we know about bobcat architecture, it should be in range of athlon64 perf.
Lets see.
Bobcat:
2 decoders, 2 ALU+2 AGU (max 4 uops per cycle), 64-bit fpu (max up to 2 uops ).
Athlon64:
3 decoders, 3 ALU/AGU (max up to 6 uops per cycle) 64-bit fpu (max up to 3 uops per cycle).