It seems like it was just yesterday that PhoneGap 3.2.0 was released - well, it was just a few weeks ago - but already we have PhoneGap 3.3.0! The big change in this one is support for Android 4.4 KitKat, but according to the PhoneGap team, this release includes a bunch of bug fixes and improvements to Cordova as well. You can find the full list of changes in the release notes.
PhoneGap Build support still isn't ready yet - early next year, they're estimating - and as before, the release page includes instructional code to help you get your upgrade working. Check out the full release announcement for all the details.