Burt,
I went up on Monday and was fine when there was about 8 to 12 inches of drifted snow on the Muir trail and 4 to 6 inches on the switchbacks (pics coming soon), but nervous in a few spots, particularly descending the switchbacks and descending from trail crest. My partner was nervous enough between that and what looked like incoming storms that we turned around just short of the summit. The melted snow on the switchbacks was refreezing which made it a nervous descent.
I think Tomcat is right about the incoming snow. If it gets a big dump, I think you will definitely need the cramp-ons, etc.