There's a few PSNs and release notes about it.
Short version is that it's a first class citizen on SMGR/SM/CM 8.0 and kinda kludged into R7. Even though a CM alias station will work, SMGR/SM don't know about that model.
There's a patch for SM I think. What it does is "when SM sees a J phone register, it rejigs the PPM profile data to appear right on a J phone and it does it once and it's automatic in the background and there's no going back"
In practice, what that means is once a J phone registers to an account, if you ever swap back for a 9600, it'll act weird, so delete the profile/set and recreate it.