Ok, here goes:
Snow Warning Kyurem- As said previously, Snow Warning gives Kyurem a niche as a an anti-weather/100% accuracy Blizzard abuser, which is nice and all, but there just isn't much for Hail to do. There are only a couple dozen Ice types, some of which are mediocre at best, and most other Pokémon are damaged by hail, or gain no benefit from Hail. There needs to be another ability or quality of some Pokémon to take advantage of Hail for it to be worthwhile, like Swift Swim, Sand Force, and Solar Power are for Rain, Sand, and Sun, respectively. Not much of an improvement, tbh.
Water Shuriken Cloyster- I don't know what to say to this. A STAB 75 BP priority move, ignores Focus Sash/Sturdy, and Shell Smash make for a deadly combination, which would definitely secure Cloyster a coveted niche in OU once again, whether as a Smash-sweeper, a revenge killer, or some other crazy set that someone will inevitably make. Not too shabby, Cloyster. Not too shabby.
Poison Heal Goodra- I foresee angry comments in my future (Not like I give a shit), but I'll tell you that I LOVE Goodra. Best pseudo, imo. If it got recovery, it'd be the best thing since the first wheel was carved by cavemen. No status, reliable recovery IN CONJUNCTION with Assault Vest (Dammit. :'( ), and a whopping 150 Sp. Def. There is literally NOTHING stopping it from becoming the premier Special tank of OU if it got Poison Heal. Definitely what I'm voting for.
Refrigerate Avalugg- ...God, I hate this thing. I love Ice, it's my favorite type hands-down, but this Pokémon is just SO DAMN BAD that it hurts. A spinner with a SR weakness, shit Sp. Def, it's got the makings and potential of Gale Wings Salamence (Yeah, I went there! O_O). I believe that there will be literally NO effect on the OU environment, and would just be beating the dead horse to give it Refrigerate. Well, 'That's all I have to say about that' -Forrest Gump
I think I got the majority of what I wanted to discuss, so feel free to comment if you disagree, or like if you agree (Don't care either way, honestly).