GGXX is 30fps visually, but polls for inputs at 60fps. It's never been THAT smooth, it just uses lots of tricks to mask it. The animations being the way they are in Xrd seems like it's simply to stay true to the series (and save resources at that, the current generation is being pushed harder than you think). There've actually been speed comparisons, and it's about the same.
And the reason I'm hoping for a reboot is because, let's be real, GG's story as it is now is kind of a clusterfuck. Unless arcsys wants to pull a Tekken and run with it. I'm cool with either, I'm just saying, it's a fighting game and story's not THAT important.
BB plays nothing like GG and you all know it.