Ice types are weak to Fire, Rock and Fighting. It could use a little more balancing, like it being super effective against water (the cold freezes water). Other than that, not really.
This is just speculation, of course, but Ice seems to me like it'd be a Fairy weakness. I'm sure Steel will resist it, so I won't have any problem with no damn pixies. Also, Ice is weak to Steel, and only resists itself, which self-matchups can be rather ineffectual compared to other matchups, and as many Types that are weak to it also resist it, statistically making it possibly the worst Type. This makes me think they'll improve it somehow. Hopefully they'll add advantages over Fairy as well as even rearrange it's matchups with already existing types. I also hope they'll boost the Bug-Type, as I mentioned. Bug-type could use the boost, as other than Volcarona for it's near-pseudo base stats, the only really good Bug-Types are Bug/Steel pretty much. Other than Galvantula just because it's awesome.
Speaking of Bug-Type, by the looks of Vivillon, Game Freak is back to making Bug-Types as crappy and boring as possible.What about all the awesome Gen V Bugs? Why can't they manage to make anything like them again? I could be rushing my opinions, but in Gen V Shelmet was the only Bug-Type I didn't like, and that's because it wasn't Bug/Steel. Well, also the ninja Bug thing for it's looks, and I don't know statistically for it.