The Fuji X 100 has more useful feature built-in than Leica X1 has ever been conceived. The Leica X1 is dead even if the X100 is priced to match.
The X100 would also challenge the M8/9 equipped with only 35~50mm lens. All eyes must now be on IQ.
The O/EVF is a game changing concept. The EVF is said to be 1.44M in resolution...800 x 600 x RGB? [same as Oly E-P2 or Pany G1/2], good enough for me. 100% EVF coverage is expected and so supported.
If we accept 6Mp (a la RD-1) as being useful, then the 35mm equivalent fixed lens actually covers 35~45mm using the digital zoom technique. Perhaps one day soon, Fuji would actually offer a screw-in 2X extender [a la Canon G7~12]. A 37~70mm range would be very nice.
The APS-C sensor would have 6u pixel size...and ISO 6400 with boost!
Fixed lens means no dust can get in, no need for sensor cleaning gizmo.
The lens aperture ring has an "A" setting, and the shutter speed dial as well...so direct auto mode control. That couple with direct +/- 2 stops exposure compensation, what more would one need. I am sure there will be a menu-selectable auto-ISO setting.
Auto-focus is built-in...another reason for no interchangeable lens as yet. Although the brochure did not say it, why equip the lens with a focusing ring if manual focus is not supported.
What is most interesting is the body dimensions match Leica pre-M8/9. The lens is a thin 20mm thick pancake. No weird strap attachments, no unusual gizmo...
The X100 spec. say .5x OVF magnification, and looks like with dioptric correction built-in [wheel left of eye piece]. I would not doubt Fuji or others would make a VF magnifier...there are plenty of perimeter VF room to use, as much as a 1.25X, making the VF a 0.75.
I have seen no picture to confirm this, but I am sure Fuji would not omit a tripod screw hole.
The camera needs no side grip [more money], no external dioptric correction lens [more money]...the only thing I have not found as yet is reference to image stabilizing, something I don't care for anyway.