This build takes everything from FK09 and makes it much more stable and we have seen very little in the way of bugs. It appears that this build may actually be an OTA candidate as well.
The list of the changes we discovered from our Discussion thread has been copied from the General thread to this thread as Post #2. Screenshots are still available there.
I've compiled a few Screencast videos showing a few of the features that we've found in JB.
Lockscreen Features Overview
Launcher Features Overview
Motion Features Overview
Samsung Keyboard Features Overview
Flashing the TAR will result in ALL Internal Storage being wiped. Be sure to backup everything!
The TAR is completely stock and is not rooted (for instructions on how to root please visit my Repo How-To Pages). It must be flashed with Odin as Mobile Odin does not flash modems correctly. If you don't use Odin you will not be able to flash the modem and this build is not compatible with any other modem (also this modem doesn't appear to be compatible with ICS or GB).
For downloads go here: http://www.rwilco12.com/forum/showthread.php?tid=23