If you're not sure whether or not your computer can run the game well enough, then wait until some benchmarks start popping up over the next 2 weeks.
That will give you a clear idea where you stand.
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Think I can go ultra with everything on? Mainly want to be able to use HairWorks if it doesn't kill FPS (I'll be playing at 1920x1080).
Intel Core i7-5930k
Asus Rampage V Extreme
16GB GSkill Ripjaws 4
EVGA GTX 970 FTW (overclocked even more)
I have the same gpu as you. If you don't mind - what were you able to push your core / memory clocks to? I was only able to stabilize at +110 on the core and +200 on the memory. @ +16 mV (any more volts and it crashes).
So ~1502 core / 3700 memory clocks.
I didn't win the Gpu lottery, but it's not too bad.
To answer your question - I'm hedging bets that you can pop quite a few Ultra settings on. Perhaps not all, but many.