Keep an eye on the weather forecast - this
site is a good start. An intense, but fast-moving storm will go thru tonight/tomorrow, then turn cold.
You've seen the thread related to the stranded Forester. Sometimes the actual snow level is lower than the "Road Closed" sign at the 6K' point. If snow is forecast during your trip, consider dropping your friends/gear as high as you can safely drive, and then park the car a mile or so below the current snow level.
Having Doug's phone number in your cell is a good idea. Or better yet, stop by the Whitney Hostel and ask if they have any info on current conditions.