http://www.olympus-global.com/en/news/2007a/nr070305edeve.cfm

"The newly developed, original SWD system enables automatic focusing at ultra-high speed with ultra-high precision and silence. When combined with the forthcoming E-1 successor model, these lenses will achieve the world's fastest-class autofocusing..."

Lenses to be released with SWD:
ZUIKO DIGITAL ED 12-60mm (24-120mm) F2.8-4.0 SWD
ZUIKO DIGITAL ED 50-200mm (100-400mm) F2.8-3.5 SWD
ZUIKO DIGITAL ED 14-35mm (28-70mm)F2.0 SWD


Other Lenses:
ZUIKO DIGITAL ED 70-300mm (140-600mm) F4.0-5.6
ZUIKO DIGITAL 2.0x Teleconverter EC-20