Alakazam-Mega should move from OU to BL. (BL because UU already banned Alakazam). Probably an oversight.
Birdspam and Aurora Veil play in OU moved quite a few Pokemon up. And Kingdra finally officially joining after having been hot on rain teams for a while. A good chunk dropped, most of them Megas that would've dropped regardless. Latias-Mega and Heracross-Mega could move back again at some point, otherwise its all likely permanent. This means that the OU list is finally freed from unviable megas released late.
UU is gonna explode though, where to even begin. They have so many things to reintroduce as well. Wonder if the absense of Ninetales-Alola and Smeargle joining will mean Webs is gonna be more common. Mantine could very well be stolen by OU at some point, so no biggie there. Nidoqueen was the glue of RU, then UU takes it for such a short time only. We're moving in circles. The powercreep in UU is moving further along now, mostly surprised Camerupt-Mega dropped. RU might have a few megas introduced soon, perhaps for a few of them to just get a banhammer, unless UU does that to them all. RU gets some nice things officially from lower tiers. Quagsire will probably stay now that Mantine has left. It's a decent mon in all tiers, which is better reflected now that its not in PU.
What an update.