I meant no more than what you said
It is a bit over my head but it is about what D. Kanter discusses here:
http://www.realworldtech.com/haswell-cpu/4/
So more executions ports but also more 'resources', and how that going to affect existing multi-threaded code. As to me it looks like the 2 thread will have more room to play / the core will have more room to dispatch instruction of the two cores.
So you kind of answered me wrt to the SIMD, as they added only another Multiply alu (FMA doesn't exist before AVX).
Though I still wonder about the overall "results" on multi threaded code and if could get greater than the 10% increase in single thread performance, I think it should though I do not the extend.
EDIT
D. Kanter says, and he knows what he is speaking about, that existing applications should see a boost of ~10%. But looking at the scope of applications he might be looking at I wonder what would be the impact on for example games /multimedia apps. I would think that when it says 10% that includes plenty of workloads that may not or barely touch the SIMD.