Not sure what it changes/fixes/breaks, but it at least SHOWS a new version number
. I didn't have mine long enough with the 33g firmware to be able to say it made it any faster or slower either...
Just wish they'd add .lit files to the compatibility list directly, without converting. Seems that my .lit files are formatted better than the resultant epub files that Calibre outputs. B&N DRM would be nice as well.. Wonder if there'd be a way to pull whatever they use for DRM on the Lite and put it on the regular Jetbook?