The default theme in WordPress 3.0 has been updated to version 1.1. If your running WordPress 3.0 you should find an update indicator in your admin panel under Dashboard > Updates.
WordPress Developer, Andrew Nacin reacted to questions by users in the WordPress Support Themes and Templates forum to confirm the changes.
Hey all —
The only real change is that I removed the half-baked code using the wp_title hook in order to customize the page title, and instead the code was moved back into header.php and simplified a little.
I can call it half-baked because I was the one who wrote it. It interfered with some plugins and so we yanked it. Twenty Ten is also likely going to be picked apart by up-and-coming theme developers, and I didn’t want my inventive technique to gain any traction. (I’d much prefer we introduce a replacement wp_title(), which you’ll likely see in a future release.)
We also made a few minor changes to attachment/media styling and markup. Just some tiny improvements for a few edge cases.
There’s a ton of other small changes in there — style.css for example — but they’re all stylistic. (Ha! — get it?) We alphabetized the CSS properties because that’s what the theme guys like. 🙂
I see Mo already posted the full diff. If you’d prefer for your head to not explode, here’s the log of commit messages:http://core.trac.wordpress.org/log/branches/3.0/wp-content/themes/twentyten/.
Hope that helps.
Nacin
The details are in this link the developer provided to show the log of the changes.





















