A lot of small things have been done. Sticky title bars are back. There are some What's New changes (including a Mark All as Read if you're on the desktop). The Alerts button is back where it was previously on mobile. There are tons of tiny visual fixes all over the place too.
As far as I know, all functionality from the old look has now been reimplemented. If I missed something, please let me know.
On the visual said of things, there are some graphical issues on iOS devices right now due to the ineptitude of Mobile Safari. The most obvious of these is the long-standing issue with the right side of the ParkFans ticket. Fixing iOS graphical issues is next on my todo list.
If anyone sees anything else that looks off, let me know!