The new look is lighter, a little less crowded, and more clearly directs the user to the next step with more prominent call-to-action buttons. A small gallery of screenshots comparing the two can be seen at the bottom of the post.
Regarding the switch to Dynect for DNS service, Joshua Strebel, founder of Page.ly, says this:
This move has all sorts of advantages for our customers and us, mainly rock-solid DNS for faster and more responsive domain lookups and allows page.ly to stay focused on the WordPress performance and security side of things. Consider the bar raised.
Dynect also touts customers like Twitter, 37Signals, and Mashable.