The Unlimited JK is the offspring of the TJ & XJ. A 4 door Jeep w/ Great potential. 4 removable doors, removable roof, folding windshield and all that on a Real Frame not a unibody.
What do a lot of XJ owners do to their Jeeps? They make removable doors, they add subframes to support the suspension and strengthen the unibody, they four link/coil over the rear, they cut and chop the roofs off and add in roll cages. Hmmmm......sounds a lot like what the JK already is. Makes me wonder why I keep throwing money at my beat up old XJ?!?!?
As for the KJ Liberty, I think we have seen the most it will be w/ IFS. (32's, 4.10's, 2.5-3" lift) I would be real surprised if a company will persue making a radically different front IFS lift system for it in the future. I doubt we will see a stronger front diff for it to make it live w/ 33's or larger. I think the KJ is a Great, capable 4x4 for a lot of people and a Lot of trails. I like mine a lot and I am pretty sure I will keep one around for a long time to come.
I could care less about another version of the same old IFS Jeep for wheeling purposes and I would probably only consider a new IFS Jeep for DD duty. (Unless they come out w/ something that can Really accept the big mods and the aftermarket runs with it

)
I think I will just keep on planning my Future Jeep, Unlim JK build w/ built D60's, 4:1 (or lower) transfer case, 37's, Diesel conversion, etc. etc. etc......... I am pretty sure it will make for a pretty capable rig that will haul my family around and
I will like it.