This might be related to Dropdowns (site chooser, inbox, notifications, mod inbox) no longer use uniform styling, but that was fixed last night and I'm still seeing this. On per-site metas I now see a darker gray background for the standard four tags, like this:
I don't have an older screen shot to compare to, but they didn't previously jump out at me so much. I turned off Stylish to make sure it's not something I'm doing; no change. This screen shot was taken in Firefox on Windows 7.
Also, I'm not certain, but I think those bright orange username links are new. It looks like the same orange we were seeing in achievements on beta metas last night.
Is this intended behavior?