i had the opportunity to try out the 9-18mm f4.0-5.6 earlier this evening when they showed it off in one of the E-Knowledge sessions @ Olympus office in Valley Point Office Tower. Too bad though they didn't allow me to shoot a sample on my memory card. I was about to pop in my card when the guy told me, "you can only use and play around with it here but we can't let you take the photos with you yet as it is not yet production release here in Singapore".
The unit I used had version 0.9 for the firmware. Ultra wide angle was nice though, almost 180 degrees (give or take). I asked them to confirm if it was going to be released this September, and all they could tell me was "soon".
Anyway, I think the 7-14mm might be a better choice (albeit a bit higher priced too). One other Zuiko lens I got to try was the 50-200mm SWD. It was so quiet you won't hear it focusing. A bit heavy though (heavier than the 70-300mm kit lens).
Also, there was a demo of the 11-point AF system via live view, and it seems that it only works on some lens, particularly:
14-42mm (kit lens)
40-150mm (kit lens)
28mm (pancake lens)
and the new 9-18mm