Well
definitely in one important way - much lower power draw guaranteed
(Even if it the possible, 'huge' 150w, that's << than a 390/X and vastly easier to cope with in a normal build.).
Faster == goodness knows, probably not meaningfully. There'll be some new features which some things will like, less memory bandwidth which other things won't etc. Probably a lot of silly arguments too!
And definitely wait for the better AIB cards if possible - they've shown multiple times that cards with this sort of power draw can be cooled basically silently.