Update from some brief play testing:

Curse now sucks. Might as well take it out and give us +DC or something. I'd settle for changing it to +25%.

Niac's Biting Cold
Still capped at 1d6 + 20 (regardless of WaS III)

Ice Storm
Description still messed up
descriptions claims 1d6 + 15, dice claim 1D6 + 10 - the dice are right.
Cold is doing 1d6 + 13 on WaS III (e.g +MCL working)

Cone of Cold
Still capped at 15d3 + 45 (regardless of WaS III)

Otiluke's Freezing Sphere
WaS III +3 MCL works!!!
Blast radius fixed (feels like Acid Blast/Fireball rather than DBF)
(Combat): You hit Fiend-Blood Lion for 1,822 points of cold damage.

Polar Ray
Range not extended like other ray spells
Mostly misses if jump cast

Glacial Spellcasting VI
Now available

SLAs on WaS III aren't that good IMO hence I can't comment much on how the longer
cooldowns affect this. I'll notice it a lot more on my Air Savant.