Can be found here. The Pokébank data is what you really want to see, since it's far more popular than the regular OU tier, and it's what our metagame will look like in two months anyway. Of course, reading into this is a bad idea, because it's just a week worth of data, and we're still in this phase where we want to try all our new toys. Not surprised by Aegislash being the most popular, of all the new Pokémon it's easily the one that shows the most potential, partly because there aren't many new Pokémon to start with, partly because they're nowhere near as brutal as the gen 5 Pokémon.
Also, note that many Pokémon were unbanned with the start of this new generation. They are: Blaziken, Deoxys-RS/LG/E, Excadrill, Genesect, Landorus-I, Manaphy, Thundurus-I and Tornadus-T. No complaints there, I would've done the exact same thing. This leaves Mewtwo, Darkrai, Shaymin-S, Arceus, Deoxys-FR, and the cover legendaries except for Kyurem-N, Kyurem-B and Zygarde. In addition, Sand Veil, Snow Cloak and Swift Swim are once again fully usable.