According to 43rumors sources Olympus will announce two new MicroFourThirds lenses:
1) The new M.Zuiko ED 75-300mm f/4.8-6.7 (equivalent of 150-600mm in 35mm)
It is the world smallest 600mm zoom lens. It weighs 430 grams and has a diameter of 7cm and 11.6cm length.
It allows nearly silent HD movie recording.
The new lenses are made with ED (extra-low dispersion)
It will be available in December 2010 for $899.99
2) the new M.Zuiko ED 40-150mm f/4.0-5.6 equivalent of 80-300mm in 35mm)
It weighs 190 grams.
It will be available in November 2010 for $299.99
According to our sources prime lenses will be announced in the months after Photokina.