Scott Kelby’s Photoshop Insider – Why I Think Lightroom 4 is Going To Sell Like Crazy:
The improvements in Lightroom’s Development module are so significant, and so much better than what we’ve ever had before, that I think you’ll be hard-pressed to find most anyone still using Lightroom 3 in just a few months from now. In fact, if they didn’t add another feature, it would still be worth the upgrade just to get better looking images. If you haven’t downloaded the beta, here’s the link-see for yourself.
Lightroom 4 is the first version that supports video editing. It’s very basic, but it’s a start.