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It should be a bit more efficient per-clock compared to Haswell, and also consume less power per-clock. Intel quoted the GPU performance improvements with 40%, which would probably translate to 20% real-word performance increase.

So all in all, nothing to get overly exited about, but I expect the Broadwell to be a next evolutionary step into closing the bridge between the mobile and the desktop.

Now, Skylake is when exiting things will start to happen. AVX-512, DDR4, Thunderbolt 3.0, mmm!
 
I'd expect upgraded GPU to GTX 800 series and maybe an upgraded panel to 4K giving a desktop resolution of 1920x1200 in "retina" mode.

I know some people think that is unlikely but we've had the same 2880x1800 panel for two years and a small number of other 15.6" laptops are shipping with 4K panels now.

I'm also expecting Apple to bring out a 4K Thunderbolt display soon.
 
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