I've noticed as well. I like how this is now done as though each season is an album. However, one thing I'm not a big fan of is how Front Row now shows them. It seems that when going to TV shows in FR, you now have a listing of each season instead of them being under one show-titled heading, with seasons under that. IOW, Front Row used to look like this under TV Shows:
House
Lost
The Office
I have multiple seasons of The Office, and it now looks like this:
House
Lost
The Office
The Office
The Office
Note that it pulls the show title, but no way to know which season. Of course, logic dictates the order, but it just looks dumb.
On another note, did anyone else happen to notice you can now add artwork to .mov files? I know a there's a few of us out there that use the reference movie trick to get .avi's into iTunes. Before you could only set poster frames from a shot in the video and set that as artwork. Now you can finally add whatever artwork you like. About bloody time...