aehric wrote in post #17999210
Cfast 2.0 cards are nice. Solid construction and FAST!
I kind of wish Canon had just jumped the gun and put two in there and dropped CF altogether. I say this as someone heavily invested in CF.
Now, if everyone would be so kind as to go out and buy a ton of them please so the price goes down that'd be awesome.

thenextguy wrote in post #17999247
Nikon got it right by letting you choose.
tonyxcom wrote in post #17999255
Yes, and by the looks of the D5 the memory card assembly is modular so its probably somewhat trivial for them to adjust production as sales dictate simply by swapping the memory card module.
I would have preferred dual CFAST slots. I come from an IT background where my motto with data is "1 is none and 2 is one" so I have always written the same images to both cards.
Well, even with CFast + CF, you should still be able to get 14fps and buffer of ~70-ish RAW, which is still better than the original 1DX. Which I'm sure is comparable to the D5 CF-card version. I can understand why Canon opted to do this. After all, they've been doing CF/SD for years and no one seemed to really complain. It was when Canon went double-barrel CF with the 1DX that the SD community got pissy for a bit cuz that forced them to buy CF. 
So the CFast/CF combo would generate the least uproar for now and allow more people to focus on the improvements, instead of the "boohoo, I now gotta buy 2 CFast card and they're (currently) SO-MUCH-MORE expensive" whiners.
It's not like you can't write to both CFast and CF card and still have backup capabilities.