Well, thank you to all of you and...I am as confused as before.
Maybe I should have explained something more about the possible use.
I don't mind large cameras and I am getting rid of a lot of what I don't use to keep only one DSLR system, still sometimes I just don't want to bring out anything which cannot be put into a pocket. Right now I use a Samsung HMX-W200, that's a pocket camcorder which is barely able to take a still picture but is completely stealthy because it looks like a phone and is water resistant and shock resistant. I'd like something which could get me a reasonable pictures I could, say, print 8x10" size.
Of course a possibility are the M4/3 cameras but I just don't want to get into Olympus market again. I love their lenses but I don't like their habit of producing something for a while then stopping the update and eventually discontinue it altogether. They did this with the Pen, then the OM system, now almost completed the same operation with the 4/3 E-System (I am still a proud owner of two E-1 bodies). I am sure that when FF and APS "mirrorless" (sorry) will be the rule they will stop anythig conected with M4/3 as well, so no thanks.
I could be interested to APS mirrorless such as Sony or Samsung but probably not right now. They are nice but with a capable lens don't fit into a pocket and once I have to carry something I can as well carry a D4-sized camera which at the moment can do many more things which I like to do with a camera (in particular command many wireless flashes).
Now the three names I mentioned are the pocket cameras which caught my attention because they all seem nicely made and have a reputation for decent to good images. I know of course anything one can read in a test, I just hoped for a first hand impression which goes behind that. A 10Mpx picture seen at 100% on a computer screen looks almost always worst than a 20Mpx picture on the same screen but when one print at a given size (let say 8x10") the story can be different sometimes and could depend much more on the lens, the software etc. A camera can have a billion features which are all a pain to access because they are hidden into stupid menus or a pleasure to use just because it does what one expect it to do...
I was looking for such impressions (while at Ricoh develop their FF pocket camera, Sony makes a better menu for their NEX and makes a FF with a completely collapsible lens).