Very sad. I got my 3b+ and took my card from 3b and put it in but it would not boot. Would have been nice to have gigabit and ac wifi (also would have to figure out how to make it a wireless router too since it is a different chip set). Guess I will just have to stick to 3b and jessie.
I tried ubuntu mate and it doesnt boot. I guess I will have to wait for some of the other OSes to be updated before I can test