I suspect that the GF2 will not feature a built-in viewfinder. Sony's NEX models have put a lot of pressure on Panasonic to downsize the GF1 successor. Looking at the cross section of the larger, SLR-styled Lumix G cameras, the high quality EVF takes up quite a bit of space. They could integrate a smaller, lower resolution EVF into a GF2, but I'm not sure I would use it much after having become accustomed to the high grade one in the G1/GH1.
So I think we will see a significantly more compact and lighter GF body; one which exploits the smaller MFT sensor size. One of the kits will most likely include the diminutive 14/2.5 pancake. It'll probably use the GH2's battery which is thinner than the previous battery. Being smaller, the GF2 would make an excellent back-up body to the larger G1/2/H1/H2. Coupled with one or both of the pancakes, it would also be a good kit for incidental photography - a camera to have with you at all times.
I gotta agree with this. As much as I hate to, sales talks. And people seem to love the NEX cameras.
But at the same time, the X100 has made a LOT of noise. Maybe they'll redesign the G line to be more compact instead. Or introduce a GX line.
If I were to buy today, I think I'd get the G2 over the GF1. The addition of video seals it for me as I've found I generally am carrying the GF1 in a bag of some sort anyway. The only plus was GF1+20 kit was the cheapest entry to m43 while being able to get the 20 at the time =) Well, that and it looked cooler.