It's tough for me to so much as plug this camera into an existing category, much less pass judgment on its suitability. Fuji is pioneering new concepts here and that may explain why they're "going retro" with the general design, which I have no hesitation labeling "beautiful."
Foremost might the hybrid finder, which is beyond anything I'd dared imagine as a digicam viewfinder solution. If the execution is half as brilliant as the concept it could force other makers to emulate it--and everybody wins. (The rumor mill is whispering about a pro-grade Nikon mirrorless system announcement this spring, which would surely need a top-notch finder to attract the pro market.) I also like the finder's place to the far left, which means I wouldn't be forever pressing my nose into the rear display. Left-eye dominant folks might find otherwise.
The fixed prime is a surprise, but not unprecedented alongside the Sigma DPs and Leica X1. Surely Fuji invested their vast optics experience in making it excellent, and it is fast. Clever too is the internal ND filter, which will be a big help in taking advantage of the f:2.0 lens in daylight, as well as facilitate dragging shutter speeds for time exposures. Since it's a leaf shutter the camera should be effectively silent, and synchs with a flash at all shutter speeds, a big deal when using daylight fill flash or external flash.
Likewise, Fuji's imager and processing prowess should be on prominent display. If they can do it for Hasselblad....
Reconsidering what category to plug it into, the X100 will cost as much as, say, an E-PL2 two-lens kit with finder--an entire system for the same money. OTOH it's barely more than half the price of an X1, which doesn't even pretend to give you a viewfinder. Or, for the money you could buy both DPs (but be prepared for a mountain of frustration using them).
The digital market is squeezed from both ends. DSLRs are a mature market and no longer advance by great leaps, so sales are leveling off. Entry level compacts are being replaced by smartphones. Out of nowhere, mirrorless systems have staked out a good market share in a bit more than two years, especially in Japan and Europe. Because of all the turmoil, we'll see further innovation as even the most stodgy makers (i.e., Canon and Nikon) decide to hop off their comfy perches and turn their designers loose. In five years we'll hardly recognize the joint.