When the Fuji X100 came out a year ago, many people found it highly desirable, but some wanted exchangeable lenses. This was not a trivial task, of course, but Fuji has done it. They have just introduced the Fujifilm X-Pro1 at the CES show in Las Vegas.
This camera won't be cheap (maybe $1500 body-only), but it seems likely that it will punch the hardest in its size class for image quality, maybe even similar to the much more expensive Leicas.
UPDATE: Emptyspaces said:
Just got back from CES, and got a chance to handle the X-Pro1 a bit.
They had a 40x60" print hanging in their booth taken with the X-Pro1, amazingly detailed.
Different Bayer array should make for sharper images (Fuji explained it as a 6x6 array vs. the normal 2x2).
16MP APS-C sensor.
Physically it's a little bigger than the X100. The lenses are fairly small, kinda reminded me of M42 lenses.
Killer hybrid viewfinder.
Thanks. Yes, the pattern in the sensor is more random than usual which helps with Moiré patterns (interference patterns on clothing), so they don't need the usual mild softening filter to combat this. (This idea is pretty old, and older in digital printing (stochastic patterns), it's a pity it has not been used more often yet.)
It seems clear that while the camera is meant to be more compact than most SLR cameras of course, it's not more compact "than it needs to be", and they seem to not have compromised on strength and handling, I think they aimed clearly at a pro camera.