In reply to methodman:
I did Mont Blanc on a splitboard two weeks ago via the Grand Mulets there was loads of snow and it's snowed since above about 3000m.
I haven't tried to descend the 3 monts route or the Gouter but I can tell you my thinking as to why I didn't. The snow along the top ridges is all very wind affected and horrible to ski so you're probably better off getting out of that snow as soon as possible. On the Gouter route you'll be on a wind scoured ridge all the way from the Gouter refuge to the summit. Everyone generally leaves skis at the Vallot shelter anyway as you couldn't really ski the summit ridge as it's too narrow and icy. The only reason for carrying them to top is to ski off the north face but then you'd be committed to the Grand Mulets descent.
The mulets route drops off the ridge either right from the top if you ski the north face or just after the Vallots refuge and is the standard ski descent for a reason. The descent is relatively sheltered and gives a pretty consistent slope with little objective danger. The main danger is from seracs breaking off from the dome de Gouter but you're not in the firing line for very long.
Keep an eye on the Chamoniade for general conditions (
http://www.chamoniarde.com/) and definitely call the Gouter and Mulets and ask what conditions are like now. Book up early if conditions are halfway decent it will be busy.