There have been reports at dpreview that the E-PL2 exhibits a "red dot" problem. The problem is, when shooting into glare or at the sun at certain aperatures, that lens flare creates a "grid like" flare appearance around the source of light. Apparently other digital cameras in the past have had this problem. It is caused usually by a coating on the pixel microlens or the microlens itself, at least from what I have read.
A thread was started here by a user who contacted Olympus service about the problem.
Olympus Customer Service - E-PL2 red dots [Page 1]: Micro Four Thirds Talk Forum: Digital Photography Review
Here is one of the original threads that brought this issue up:
e-pl2 red spot problem [Page 1]: Micro Four Thirds Talk Forum: Digital Photography Review
Also, here is a link to a chinese website with some photos that exhibit this phenomenon:
I'm not posting this to start wars about the camera. I know some users here have the camera in hand and maybe able to shed some light on the issue. I know that none of the other PENs exibit this problem. I'm just posting this as an FYI. I even think Kirk Tuck had comments on the issue.
If the problem does really exist, then its up to folks to determine if it is an issue for their regular shooting habits. Again, this is an FYI only.