Yes, looks like they made colors throughout the site more vibrant. The new colors are slightly straining to look at, especially with brightness at 100%. Maybe I'm crazy?
You're not crazy. I think the people who want such colors (which I'm guessing is a very small minority) should use a custom css, instead of straining the eyes of the majority of users.
Lots of small incremental changes; buttons, inputs and textareas (different hover/focus styles), ... Not surprising considering they rolled out the new header not too long ago.
c'mon why so serious, it's so easy to ask to fire someone. Do you really think the style engineer just pushed the update all by himself without anyone taking a look at it?