Olympus just announced two new Micro Four Thirds zoom lenses, the M.Zuiko Digital ED 75-300mm f/4.8-6.7 and M.Zuiko Digital ED 40-150mm f/4.0-5.6. Both are Micro Four Thirds versions of existing Four Thirds lenses. I'm a huge fan of the Four Thirds 70-300mm zoom, so I'm really excited about a smaller, dedicated M43 version.
New Olympus 70-300mm & 40-150mm Micro Four Thirds Lenses >>
The 40-150mm is interesting too - especially since I took the Four Thirds 40-150mm with the E-PL1 on my trip to Mazatlan - the trip I based a good portion of my E-PL1 review on.