Most of the team has decided to move onto another engine and try their hands at making a game, or a mega mod, I'm not sure which.
Raz0r posted at the filefront forums that the team has decided to stop production on the mod at this time.
Kinda sad really, but they want to move on. OJP wasn't really meant to be a mod per se, but an archive of material that everyone could use in order to speed up mod production. They have decided that it was time to return to that philosophy, so anybody can still use OJP/JKE as a base for their projects, but the original team is done.
You may be able to PM Raz0r to see if he has the last build 1.3. It was mostly done I believe and was just being bug tested.