Unfortunately it doesn’t look like nav menu functionality is here yet, so whilst i do have a nice flashy theme to show off (i’ve been using it in WP 3.0 anyway), i can’t use the nav menus here, because the nav menu page just says “No peeking”. Oh well, given time i’ll have some menus… until then you can use the tags to the right to browse around (there’s not much here to see yet anyway).
You can expect to see Twenty Ten as the new default theme shipping with WordPress 3.0 on it’s release. I’m going to reserve any criticisms i have for the theme until release time (i’m not hugely bothered in total honesty, it’s just a theme, blogging is about content isn’t it?).