My iPT5 rubber case fits perfectly over my new iPT6. The only thing is that there is a hole where the wrist strap that I never used used to go. But I don't mind it at all. Now go out and buy your iPOd Touch 6!
Nope, they are still on the left side. Pretty much everything is the same on the exterior except for the elimination of the Loop. My 5th-gen case (which was so cheap it didn't even have a cutout for the loop in the first place) fits perfectly fine, and even the volume button "outdents" line up fine.
My otterbox prefix arrived today. It snapped right on to my IPT6 and all the cutouts and buttons function. No cutout for the IPT5 wrist strap, which is good, and a tiny built in loop and wrist strap in case I want to use one (not likely).