Keep an eye on the wilderness conditions page
http://www.nps.gov/yose/planyourvisit/wildcond.htm.
If Glacier Point Road is not open, you will have trouble with this - unless you are planning to do the hike as a round trip from Happy Isles (this would be around 16 miles or so, mostly uphill going out) in a day, you will have to rely on a tour bus to take you to Glacier Point to start the hike back down to the valley where your car is.
Technically you cannot camp along this trail but people do hike up Ilillouette Creek to camp far enough from the trailhead.
The Mist Trail itself will probably be open all the way through; you can get up above Vernal Falls right now by way of a detour that will reconnect you to the Mist Trail between Vernal and Nevada Falls. Half Dome cables may or may not be up by then. The Yosemite Falls trail would be best done in spring, some people with vertigo find it a difficult one but some good views. You can also hike up the trail from Wawona Tunnel parking area to Inspiration Point, which is a good south rim view when Glacier Point Road is closed.