Rock Creek info:
Hopefully, there will be enough snow by January. The Rock Creek Canyon road will be closed at East Fork campground, but there is parking available at that location. (Probably "Snow Park" regulations.) From East Fork you have two options: 1) go straight up the road or, 2) go left into the campground and then through the trees (hard to follow). Road is easiest, but there is more avalanche hazard immediately after or during storms.
The road will take you all the way past Rock Creek Lake to the Mosquito Flat summer trailhead; from there continue up the right side of the creek into Little Lakes Valley.
Rock Creek winter lodge will probably be open; about 2 miles uphill from the East Fork parking area. The Pie in the Sky Cafe will most likely not be open - darn. But good food and local atmosphere at the Tom's Place Resort cafe and bar, near the intersection of 395 and Rock Creek road.
Rock Creek isn't nearly as busy and crowded as the areas closer to Mammoth and more scenic. Great views toward the crest of the Sierras. Little Lakes Valley is my favorite canyon in the Eastern Sierra.
Wherever you decide to snow-shoe, remember not to walk on tracks that have been set for xc-skiing. Have fun!
