In reply to paul walters: The biggest problem you'll encounter in Ogwen valley at the moment is parking. Because the laybys dont get cleared of snow it seems to give people the right to abandon their vehicles where ever they stop. The Idwal cottage CP is inaccessible at the moment, the laybys all along the A5 there are ok but as mentioned above, people have just been pulling up and getting out - no evidence of actually parking.
As for the climb - there's a lot of loose unconsolodated, wind-blown snow in the area. if there's a thaw and freeze it will be great (or not so much depending on what you're after!). It was glorious in the valley today though it was still quite windy and I wouldn't like to be on the summit of any significant peak. this might change but easter is like a whole week away so your guess is as good as mine but I doubt the snow will dissappear that quickly given the temperature at the moment.