Hmm as I do recall... the last time the Lions came to UVA, we whipped that ass! (I know.... I know... 20-14... still, we won!)
Speaking as a season ticket holder for the past nine years, I can tell you that the stadium doesn't often sell out, but it does usually fill up to about 47-58k per game. (Official capacity is 61,500 although the high water mark for the largest crowd was 64,947 in August of 2008)
Traffic can be a hassle, but as long as you get there early you shouldn't have any problems getting a parking space or a ticket.
Lovely stadium. Plus UVA sucks now, and probably will suck in 2012 so you should see a win as well.