you can change it in system prefs. back to the old one. one thing i dislike is the new way of scrolling if you want to scroll up you pull you fingers down on the trackpad (similar to the way you'd do it on the ipad)
Which makes sense on the iphone/ipad cause it mimics you dragging the page up and down. But I don't think it will work so well when you don't have your finger directly on the document cause it won't be so intuitive (it's more intuitive to have it the way it is now. I know cause I have had no issue adjusting to my magic mouse scrolling and yet I also have an iphone. I never confuse the two honestly and never even thought about it til this post. I had to try both to make sure and yeah, I scroll differently on both and it seems very intuitive on both to use them the way they are set up).
OS Team is taking minor things from NeXT and incorporating it in small increments into future Mac OS versions. Most of the demoed video I could do without today, no big deal. What I found rather interesting is that Mac OS Client and Server are merging in Mac OS Lion. That is something worth the upgrade period. Everything else is mere icing on the cake. What all this boils down to is because of Server side feature and functionality, we will get TRIM (hopefully for all SSD manufacturers), and some serious backend communication support. Hopefully multiple VM running at the same time as well.