Trac still does not do HTML mails. As I've written before, it can be hacked to send good looking HTML notifications, though. I happily used trac-0.12.2 until I discovered some issues with subversion-1.7.
So I upgraded to trac-0.12.3, the upgrade went seamlessly. All it took as a repository resync for changesets with removed files to show up again. Yay!
Of course trac still doesn't send HTML notifications, so I had to apply my previous patches from trac-0.12.2. Except for trac/ticket/notification.py this was rather easy. See my diff here or grab it from pastebin.