Not me. I'm going with the 3.6 and a manual transmission.
I'm looking for the updated 3.6 with 4.10 axle ratio. With the JL reportedly shedding some weight, and the 3.6 being upgraded, the seat of the pants should feel a nice increase in power. Most important to me, especially out in the middle of nowhere, is the proven reliability of the 3.6.
If fuel prices were equal, and the diesel were only a couple grand more, it came with a manual, and I could order one sooner, then I'd consider it. However, I'm betting on a 5 to 6 thousand dollar premium on the diesel over the 3.6/manual. ($1000 of it is the auto tranny). I just don't see the cost/benefit being anywhere close to being reasonable. Oh, I forgot one thing...the DEF fluid. That's another cost that defeats the improved fuel economy of the diesel.
The cost of the JLUR is going to be sky high, as is. I certainly don't need to add unecessarily to it.
I ran my JKU Rubicon at Moab with 33.5" tires, 3.8, and manual transmission. It had no issues with lack of power, at all, in spite of being fully loaded with 5 people and gear. (4.10 stock axle ratio, too.) While the diesel's torque would be nice, the gearing on the Rubi will be properly matched to the 3.6/manual. I think it will do just fine.