Kodachrome200: I wanna love these mirrorless camera's but they always seem to miss the mark by a bit. With an aps-c sensor physics is going to require that the lenses are essentially dslr sized. this makes the camera only marginally more portable.
The micro 4/3rds seems to be the right balance. but there are still some wierd issues. Like the fact that you can't get a thin profile standard prime for it. witch oddly enough you can for the large 4/3rds cameras. And dont say use an adapter, the is too big. Also the only 4/3rds camera that is reasonably small and acceptably powerfull is the olympus e-pl3. witch comes with a kit zoom that is not pocket sized. and you CANT buy it without it. (witch makes me ask what about upgraders?). I like that panasonic pancake zoom lens. combined with a small standard prime that was also pocket sized you could have a lot of photo power in your pocket.
This new sony is massive in the world of camera thats only justification is they are more portable though.