Comp Upgrades are great...but the last three flights I've been on were full in front...so not sure how great a benefit that will turn out to be.
What I would have preferred to see also added is the ability for elites to upgrade a non Y or B fare at some time earlier than check-in....as the 24 hour upgrade (with cash) benefit has been eliminated as you are now competing with everyone else for available upgrade space at check in on-line at the 24 hour window.
That said, I think the Elite line is a nice addition.