It looks like the team at WordPress.com have Ajaxified the statistics charts so they no longer refresh the whole page, a welcome change for many. For me this signals that WordPress.com has gotten to the point now where most of the changes are going to be small tweaks, rather than huge releases, and that is a welcome change for the few that have been holding back on jumping over to the hosted blogging platform.
Matt has also said that he intends on making sure WordPress.com users get more updates on the tweaks and changes happening with the service. Thanks Matt!
Have a read through the new improvement on the WordPress.com blog.