Here is a small summary of the E-P1 possible specs with a percentage of probability:
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1)Â 12MP sensor (effective megapixel)Â 99%
2) BodyIS 50%!
3) 3.0 LCD and no swivel 85%
4) New liveview which works very well with the BodyISÂ 99%
5) ISO 200-3200 50% .  Other option is 100-3200 50%. May this will depends from the final firmware.
6) Two colours – Silver (with black parts) and White/beige (and a black model?) Â 79%
7) 17mm 2.8 lens 99%
8 ) The 17mm will come in two colors (silver and black?) 60%
9) One more lens to come? Maybe a second zoom? 35%
10) Same autofocus as the Panasonic G1Â Â 50%
11) Video 720p ( Video Record can use 6 ART Fliters, and there is audio recording) 99%
12) Size 120×70x35mm 70%
13) SD/SDHC cards
14) The E-P1 can control an external flash (the FL-XXR)
15) 990$ body+kit lens 70%
16) New converter 43->M43 (with autofocus with normal 43?)Â 90%
17) external flash FL-xxR ? 75%
UPDATE:
18) 17mm external viewfinder 70%
By the way, we only have to wait 6 days to know all what we have to know :)