Re: E-PL6 (or E-PL5) as a pocket camera?
First of all the E-PL6 is almost identical to the E-PL5, where the E-PL5 is cheaper you almost lose no functionality what so ever. The E-PL6 adds ISO LOW support, which the E-PL5 doesn't get and the ability to use an interval timer for time laps functionality anywhere between one second and 24 hours. The kicker here is that it will only capture 99 frames, which at 24fps represents 4 seconds of time laps footage. It also adopts the dual-axis electronic level to stop crooked horizons. In terms of operating its still based off the OM-D E-M5 where as the E-PL7 is based off the OM-D E-M10.
I've owned an E-PL5 and its a great camera, but even with a body cap lens on it, it will barely fit in a pants pocket. It might fit in your jacket pocket, the RX100 will fit in your pocket but you'll compromise the 1inch sensor. The RX100 has a pretty good 1inch sensor but if you're going above ISO800 you'll really begin to notice the difference.
I tend to think images from 1inch sensor cameras look flat and lifeless but that just might be my perspective. I've owned pocket cameras such as the Panasonic DMC-LX7 and I would never go back to one again. You will find if you look at images on flickr or some such the best way I can describe it is in the lack of fine detail and in the contour that would otherwise make an image pop, the 1inch sensor really doesn't have it. There is a certain lack of depth and a characteristic of flatness in the image.
I find Micro Four Thirds to be a fair compromise between portability and a larger APS-C camera, 1inch sensors not so much. The only reason I'd go bigger or smaller again is if I was looking at something like the Panasonic GM1 or GM5, or alternatively if I was going bigger it'd be full frame.
I'm done with small cameras and big cameras with small sensors.