The major addition is the ability to resume the last game you left. If you exit any game though the pause menu, a 'Resume' button will be available in the main menu. Hit that and you're away! Note that only the last game you abandoned is stored.
A number of graphical glitches that were introduced with beta28's performance improvements have been tidied up. The asset panel should no longer get in the way of gameplay (finally!). We've added the option to replay the tutorial if required—you can find the button in the lower-right corner of the options screen.
Audio is ... well, err, it's close. Same thing we said last update. :| "Close". It's closer than it was!