Played about 40 games (NA) from rank 10 to rank 5 today, didn't chart, but I'd guess:
10 Hunters (6 Face, 4 Midrange)
8 Mages (6 Tempo. 2 Mech)
8 Warlocks (6 Handlock, 2 Demon-zoo-thing)
5 Druids
4 Paladins
3 Priests
1 Warrior
1 Rogue
Had a good run with
Trump's Paladin... Definitely think Black Knight is a worthwhile tech card right now - almost everything popular runs good targets except FaceHunter/MechMage