I think I can answer.
It seems their spacing game has been thrown off without wavedashing, but there are ways to compensate.
Basically, desynching short hop blizzards is the best way to space somebody in front of you, since it sets up grabs at low %'s and at higher %'s it freezes your opponent and puts them above you for uairs. IC's are still advantageous on the ground because their grab game is still excellent and their uairs still control everything above them very well.
The usefulness of ALL their b-attacks has increased. They all have good function. If you're not scoring KO's from grabs, then you can use uairs, bairs, or up-B. Basically they are one of the stronger KOing characters, especially if you can get full knockback off a grab (sometimes mashing c-stick doesn't give you full knockback... you wanna hold with one and charge with the other.) But yeah, they're very strong. Their smashes have decreased in range and dash attacks/dash grabs have their limits in approach... so their approach game is quite weak. Defensively, they have the blizzards and decent rolls, but lack of desynching off the roll limits their defensive options.
Basically, they're not that great of a character, but at the same time... they are pretty much the only character that can reliable 0-death. So if someone wants to get good at Ice Climbers, basically he'll have to fight an uphill battle against better characters and try to work in that grab, and THEN after that, not mess up on a 0-death grab combo for a guaranteed KO. But basically, without a spacing game, certain characters can dominate the IC's an entire match...
Metaknight counters them sooo badly, it is ridiculous.
But anyway, if you can score that grab, you should be alright. If not, blizzard away. That's their, well, general playstyle now.