Can't speak to the diff lock but the FI motor is the cats azz. My wife's 09 RancherAT has it and I like it a lot, wish my 04 Foreman had it. So easy to start, no choke to deal with, no jetting or adjustments have to be made to it. Basically push the start button and go ride.
That new Rubicon should be a beast and I'm looking forward to the review myself.
