Looks like WordPress released (stealthyly) a new theme. Unsleepable. It’s active right now on this blog, but I don’t see any annoucement regarding this on the wordpress.com
Edit: Just after publishing this post I notice there’s a post up.
Noticed an annoying issue of this theme with the WP dashboard bar. See attached screenshots:
The dashboard bar seems to screw up the alignment of the theme header. If this could be fixed it would be great!
Edit #2: Fixed by Bryan \o/