My personal perspective (because it's all about me.
)
Had it had 24-30 mp I know I would have upgraded. At 20 mp I want to see what else it offers.
Canon is promising significant improvements in autofocus. In my opinion, the 1Dx II autofocus had the greatest need for improvement, so I will be very carefully studying reviews and likely checking the camera out through CPS to see for myself. The autofocus improvements I want to see are very specific to sports shooting (better tracking of one player moving fast and erratically across a field or court while surrounded by others).
Higher frame rates are nice, but I've not seen much practical advantage in most situations beyond 10 fps.
Fast file transfer rates are meaningless to me, because as a one-man band I don't have anyone to transfer the files to. I get why this is important to a small group of elite photographers at the professional sports level, but I don't see that it is going to sell a lot of cameras. Frankly the 1DxII should have had wireless and bluetooth.
I seldom shoot video, so that's not a motivating factor for me.
So, I'm not ruling it out, but I'm not counting the days until its release either. I have to think there are a lot of other photographers who will take a similar wait and see attitude.