Right now it's skiing like least coast conditions. That's all I could think of on Friday when I was up, and was glad I had all those years of scraping down the hill experience. Yesterday we just took the day off as the reports from friends up top were abysmal, from spitting hail to white-outs. I'm down to my Kastle MX88's as anything else would be able to get an edge.
Coverage is not very good for this time of the year, and my trip before Christmas was better as far as general coverage. We had a 10 inch dump on about the 20th, but nothing much since then, apart from the 17inches that turned to bulletproof crust off-piste, which right-now anyway isn't viable to ski.
Anyway, general rule of thumb with Whistler is to bring your Gore Tex, and really good low light goggles, as visibility and Whistler often aren't supposed to be used in the same sentence. I love the place (this is second trip so far this season, and for sure I'll have 2-3 more), but it can be VERY challenging condition-wise.
At 11:30 there's mountain tours everyday, with different levels accomodated. I'd suggest you take one or two, and tell the guide you're uber-gnar, and he'll point out places you may want to consider going after the tour as they can't go off piste.