I think it will be very interesting to see if these guys manage to make it to Uber. It's the old stats vs. movepool vs. typing equation at play again.
Typing sucks, SR, Fighting (Keldo and Terrakion), and Dragon weak, but without an Ice weakness and with an electric resistance which is OK... but the cons outweigh the pros here. Don't get confused, sometimes I forget that they're both still Dragon/Ice.
Stats: Look beastly. 95 speed gets outrun by the musketeers and most Close Combaters, Salamence, Landorus, and even Haxorus, but is still faster than the base 90 crew. Attack and Sp.Attack look huge.
Movepool: If it's on par with Kyerum, that kind of sucks. The charge-up signature moves are useless competitively (but arguably better then cool-down moves like Hyper Beam... yay...). Also, it's going to need Fusion Bolt/Flare to get some good reliable type coverage. Black Kyurem would love a good physical Ice STAB and Fusion Bolt to be useful, White Kyurem has DMeteor, but could use some more help aside from Focus Blast and Hidden Power.
As it is, that's 2 or 1.5 /3 against Kyurem being popular... but you honestly never know...