With the latest 920 ultra-sensitive screen, objects rubbing will be interpreted as touch. That being, if power button is accidentally pressed while inside pocket/bag, screen lights up, pants/objects will continuously touch the screen, PREVENTING the phone to standby → battery drain.
This is how WP lockscreen behaves today(though capacitive screens reduce the occurrence). I don't know whether WP8 or Nokia ROMs will change this behavior(resetting timeout upon every touch while locked, even if proximity detected), else the 920 would potentially become a battery killer.
Hope you are already aware and on top of this.
[Also posted on Nokia's Facebook]
Edit: As this expands across forums and blogs, some people are perceiving us as trolls, the bad guys. It is totally the opposite: we love Windows Phone and Nokia is the best hardware for us. Our intention is to anticipate a possible potential issue so it can be fixed on time by either Nokia or Windows Phone OS, if it was the case. Also please note this is pure theory/speculation, we are not affirming.
Customer support service by UserEcho