Thought I'd start this as more interesting stuff is starting to appear on 43rumors
They show what are claimed to be:
* A tiny low resolution pic of the E-P2
* External viewfinder
* External mic
The E-P2 pic seems to be more for the cases than the cameras in them, and the only difference I can see is a nice all black finish and a taller hotshoe mount. The taller hotshoe seems to be needed to make space for an additional connector going to the external accessory, which are the external viewfinder and mic. Both fit on the hotshoe mount, so you can have either EVF or mic or flash.
The EVF is claimed to have 1.44MP, which to put into more meaningful numbers could be 800x600x3 which is nice.
Rumoured announcement next week with availability next year. I was thinking this might kill E-P1 sales, but then again if you really wanted an E-P1 chances are you have got one already. Those who wanted EVF might have gone for the GF1, but this might slow the flow away from Oly.
Assuming all this is true, I don't see any need for me to replace the E-P1. If they also put a higher resolution screen on the back might swing me though...