wbmw,
I don't see IA32E as anything more than new instructions, like SSE-x. The "beta" has been around for months, and it was called "Opteron".
I hope you are joking. If not, then I must have overestimated your understanding of issues. First of all, IA32e is an idiotic marketing term, AMD64 is a non-idiotic marketing term, so let's not call it by an idiotic name, and call it either x86-64 or AMD64. Mainly, because it is a full fledged 64 bit instruction set. Comparing it to SSEx, well, I hope you are joking, and I am not going to comment further.
Joe