Beta 3 contains about a hundred changes, including improvements to the image Post Format flow (yay, drag-and-drop image upload!), a more polished revision comparison screen, and a more quote-like quote format for Twenty Thirteen.
As a bonus, we now have oEmbed support for the popular music-streaming services Rdio and Spotify (the latter of which kindly created an oEmbed endpoint a mere 24 hours after we lamented their lack of one). Here’s an album that’s been getting a lot of play as I’ve been working on WordPress 3.6, you can see here.
Plugin developers, theme developers, and WordPress hosts should be testing beta 3 extensively. The more you test the beta, the more stable our release candidates and our final release will be.
As always, if you think you’ve found a bug, you can post to the Alpha/Beta area in the support forums. Or, if you’re comfortable writing a reproducible bug report, file one on the WordPress Trac. There, you can also find a list of known bugs and everything we’ve fixed so far.
We’re looking forward to your feedback. If you find a bug, please report it, and if you’re a developer, try to help us fix it. We’ve already had more than 150 contributors to version 3.6 — it’s not too late to join in!