In reply to mike123:
I toured over from Coire Cas to Ben Macdui yesterday (Wednesday) via 1141 and the high corries (Raibert and Domhain). Other than a couple of very short sections (literally 5 metres each) I was on skis all day from about 10 metres out of the Coire Cas car park. I went back basically the same way but over Cairngorm and down the White Lady. The off piste down hill sections where lovely - better than the pistes.
There looked to be full cover still over the other side of the Lairag Ghru on the Braeriach area (although I'm pretty sure you'd have to do a fair amount of walking if you dropped into the Lairig Ghru from Ben Macdui and went up to the Braeriach area) and there looked to be some great snow fields in other areas but I can't confirm how possible it is to link routes together so you don't have to walk much.
If you go up the south side of Cairngorm itself and traverse round so you're above the Ptarmigan bowl you can avoid the rocks on the top and still ski pretty much the whole way.
There's still plenty to do out there.