Full-frame sensor, 28mm f/1.7 ASPH fixed focal length with Macro mode, contrast-based autofocus system, integrated 3.68-megapixel electronic viewfinder (automatic switching between viewfinder and monitor)... download the data sheet for more details.

I visited the Leica Showroom in Ginza (Tokyo) on a very rainy (pre-typhoon) day... my new rain coat was well used today. You can read the specification online so I won't list them up here. Just a tactile impression from my time with the Q and talking to the staff (very friendly). BTW, there was no stock and no information about when there might be any.
This camera feels very good in the hands (I would recommend the optional handgrip, it's very comfortable and protects the bottom of the camera). My reference is the Leica D-LUX (Typ 109) / Panasonic LX100, of which I am currently researching the LX100 (it has a handgrip and a friendly list price). The Q is much more stable and solid in the hands than the Typ 109/LX100, a world apart... I would buy the Q based on the handling alone.
We did some (auto-focus) macro shots and when viewed on the display back, from what I saw, the results were very acceptable. 28mm is my second most used RF lens, and the first M-mount lens when I got my MP, so I can live very comfortably with that focal length.
The Leica Q (TYP 116) is defiantly worth a look if you are in the market... don't listen to anyone, just go down and see for yourself...
Casey