1. Word on the street is that there is going to be a Leica version. Leica versions may not be any better than Panasonic versions, but Leica tends to rebrand some of the best Panasonic cameras (FZ50, LC1, LX3, etc). Also, the Leica versions are usually better looking :-p.

2. Early reports suggest that the GH1 has the best sensor performance in a Micro Four Thirds camera to date. Seems likely that the GF1 will share this performance.

3. The rumored GF1 was pictured with two lenses and not a zoom in sight. A 40mm equivalent fast pancake and a reasonably small 90mm equivalent macro/portrait lens is a sweet combination.

4. Panasonic has gotten things right with autofocus in the G1/GH1. I'm hopeful that the GF1 will share this performance.

5. The GF1 is likely to have a multi-aspect ratio sensor like the GH1. This alone is reason enough for me to buy the GF1 over an E-P1 if they are otherwise comparable. I prefer 3:2 aspect ratio for most photography, and multi-aspect ratio gives me that without lost angle of view and lost pixels. Also, that 7-14mm Panasonic lens at native 16:9 is going to be wide.