I would still look back at this leaked slide(from this perspective I'm fairly confident it's not a fake one):


Many people came to a conclusion,primarily from C11.5 numbers,that Zambezi will have very strong FP units.A total score of almost 11 pts tells us that per one single FMAC(in shared MT mode) we have roughly 30% more computational power than one whole Thuban core,roughly at the same clock.When Zambezi doesn't see load across all cores,FMACs can be "paired up" (per module) so that in single or poorly threaded fp workloads we have a lot higher fp resources,on top of those 30%. Now on top of all this comes new Turbo boost in poorly threaded workloads.All things summed up,at least in legacy (or FMA tuned) fp code,Zambezi will be a big step up from today's cores,yes even versus SB.

What is unknown is pure integer core performance.I'm hoping for at least 10-15% IPC uplift,in non-MT workloads.Turbo should be aggressive here,even with all cores loaded so we can expect another 10% from added Turbo headroom(4.1Ghz rumored Vs 3.7Ghz on Thuban today).So effectively 25% uplift versus Thuban 1100T is not out of realm of possibility.