DSLRUsers.com

Fujifilm isn't giving any more details right now, but the teaser gives a pretty clear view of the camera's top plate, on which we can see the following features:

Shutter speed dial with X-Pro1-like locking button
Exposure compensation dial covering +/-3 EV
ISO dial (also lockable), including 'A' position for quick access to Auto
Control levers below shutter speed and ISO dials (function unknown, but drive mode would make sense)
Movie record button
'Fn' button which activates built-in Wi-Fi
Power switch surrounding shutter button
Large viewfinder hump, perhaps implying extra-large EVF
PC sync socket on front
Electronic front dial below shutter button

SLR-style mirrorless cameras like the Olympus OM-D E-M5 and E-M1, and the Sony Alpha 7 and 7R have clearly captured photographers' imaginations recently (as indeed has Nikon's 'retro' Df SLR), so this looks like a logical move from Fujifilm. Assuming it features the X-E2's impressively-fast AF system, with on-chip phase detection via the X-Trans CMOS II sensor, we suspect it'll be a particularly good vehicle for larger lenses such as the XF 55-200mm F3.5-4.8 R LM OIS telezoom. We've liked Fujifilm's recent cameras a lot, so are certainly looking forward to seeing what this one has to offer