Not sure I'd care all that much about 4K yet.
Quite frankly, I don't really care all that much about 4k yet either.. I thought I'd mentioned that, but maybe not. At any rate. I don't think 4k is really necessary, and likely won't be for quite a few years -- this part I know I mentioned.
The main motivating factors for me choosing this over the previous BMCC in micro 4/3 format are the global shutter, and larger sensor. Had I gone with the BMCC with micro 4/3 mount, as I was planning to do, I'd have also bought the metabones speedbooster, which would effectively make it behave as a super35. Given the price drop on the new 4k camera, and figuring in the cost of the metabones adapter along with the other BMCC, the price difference is $500. Lump on top of that the global shutter, and a bit of future proofing with 4k, and the decision became much clearer.
Do I plan on going out and shooting a feature (or even a short) in 4k? Not really.. but I could. But considering that to produce a 2k DCP at 2.39:1 only requires a 7% up-scale from 1k, that's going to remain a viable option for quite a long while.
Yes, I know many people don't think rolling shutter is a big deal.. it is to me. Global shutter is superior, because remember it's not just camera movement that causes issues, it's objects moving through the frame too.