As the owner of a Fuji X100, I find myself uninterested in the X pro1.
Not because of anything in the announced hardware, but because of months of frustration with Fuji's awful firmware and poorly implemented digital controls. The X100 would have been a great camera if the firmware was better conceived, and if it was possible to hit the centre button of the multi-selector without inadvertently pressing one of the side buttons. Oh - and if the various dials weren't suceptible to turning when the thing is in a pocket. Oh - and if it had an ISO dial. Although Fuji has released a couple of minor firmware revisions to the X100, it remains poorly designed and buggy.
I don't see Fuji getting those things right on the X pro1. If they don't, it will be like the X100 - a camera you can't rely on. Occasionally brilliant, and with the potential to be great, but not a camera you can trust to get the money shot. The X100 fills a niche that made it worthwhile for me, but if I want interchangeable lenses, I'll reach for a camera that I can trust.
If Fuji were to outsource their firmware development, they might have a chance of producing a great product, but I think that they are committed to their internal firmware department, and their firmware developers are firmly committed to mediocrity.