Lenses that qualify are:

FourThirds:

OLYMPUS : ZUIKO DIGITAL ED 12-60mm F2.8-4.0 SWD http://www.four-thirds.org/en/fourthirds/standard.html#i_012-060mm_f028-040_olympus

Panasonic : LEICA D VARIO-ELMARIT 14-50mm F2.8-3.5 ASPH. MEGA O.I.S. http://www.four-thirds.org/en/fourthirds/standard.html#i_014-050mm_f028-035_panasonic

OLYMPUS : ZUIKO DIGITAL 14-54mm F2.8-3.5 II http://www.four-thirds.org/en/fourthirds/standard.html#i_014-054mm_f028-035ii_olympus

MicroFourThirds:

OLYMPUS : M.ZUIKO DIGITAL ED 12-50mm F3.5-6.3 EZ http://www.four-thirds.org/en/microft/standard.html#i_012-050mm_f035-063_olympus

Panasonic : LUMIX G VARIO HD 14-140mm F4.0-5.8 ASPH. MEGA O.I.S. http://www.four-thirds.org/en/microft/standard.html#i_014-140mm_f040-058_panasonic

I focused on the Olympus/Panasonic lenses for now. I think that the Panasonic : LEICA D VARIO-ELMARIT 14-50mm F2.8-3.5 ASPH. MEGA O.I.S. and OLYMPUS : ZUIKO DIGITAL ED 12-60mm F2.8-4.0 SWD are good candidates. Especially the Olympus has a very long range (24-120mm in 35mm terms) while still offering a F2.8 wide-angle (and constant F/4.0 over entire range). Documentary shooting is about making trade-off and I will always have my primes for really dark situations (Voigt 50mm/.95, SLRMagic 12mm/1.6 and Olympus 45mm/1.8).

Does anyone here own one of the above lenses? Please share your opinions with me. I probably wait until the Panasonic X 12-35mm and 35-100 are announced as they could be good candidates too, although 12-35mm is a more limiting range.