Why does everyone care about Ivy? Everyone! It is a little bump. It has proven nothing but same 5-10% gain as before.
Yes there is a bit "latest greatest" envy, but the speed bumps won't be from the microarchitecture, it will come from the process shrink. There is little generally wrong with a process shrink as it typically leads to "faster".
For those with workloads that scale by core Ivy likely means another two cores in the single package line up and another 4 cores in the dual package line up. That will be much more than 5-10% on those workloads.
We'll see. If they cap the E5 1600 cores that their current level for Ivy (at 6), it is probably even more likely will see some iGPU additions to the E5 line up when get to Haswell. If they move the 1600's to 8 max that will be not so good sign for iGPU at next step.
It has heat issues for overclockers which generally means it is less than durable compared to SB-E variants.
Overclocking is overrated. Processor controlled dynamical adjustments to clocks are only going to get more effective in the next couple of generations.
The funky "Turbo" buttom from white boxes of the 80's-90's is going the way of the VGA socket.
Care about Ivy if you need mobility thanks to integrated GPU gains. It is less attractive as a desktop chip right now. And the GPU is removed from the Xeon versions anyway.
Actually the Xeons as a brand name have picked up the iGPU. The E3's.
They are likely coming to the elements of the E5 series that are workstation aligned also. Either at Haswell or at the next process shrink after 22nm (Broadwell ) . 10 cores is getting in to the goofy range to keep adding fully complex x86 versions. Dual packages will have 20 cores. Quad packages 40.
At some point the "cores for cores sake" becomes a dead end just like the "GHz for GHz sake " was a dead end for the Pentium 4. Probably different cores and different abilities mixed on the same die rather than just being core junkies.
Whatever "hack" Apple comes out with to deliver Thunderbolt with the Mac Pro with is completely dissolved if the workstation E5 either have iGPUs or glut of PCI-e lanes to deploy. The E5 2600 series already has the glut. There is only one missing piece; the 1600's.