I like the new design, but I also like WP7... the current market isn't that great for app discovery, this one is better for browsing. The featured menus need work... almost seems like some "tiles" are out of place, like they rushed a jigsaw puzzle. I bet this will look amazing once it hits tablets.
Here are a couple videos of the new market for anyone who wants to see what it's all about before overriding your current market....
Official Google Promo:
http://www.youtube.com/watch?v=5Pbo-d62ivY
On-device walk-through:
http://www.youtube.com/watch?v=6trv3WdqILk