E-M1 firmware is officially released now, there is a manual update too:
Firmware: olympus.co.jp/en/support/imsg/digicamera/download/software/firm/e1/
Manual: olympus.co.jp/en/support/imsg/digicamera/download/manual/omd/correction_em1_e.pdf
Thse are the improvements:
- AF tracking during C-AF continuous shooting in continuous shooting H mode is supported.
Previously, in continuous shooting L mode 6.5 frames per second was possible, but now taking a maximum of 9 frames per second in continuous shooting H mode is possible.- * We recommend setting C-AF Lock as standard when using C-AF.
- OI.Share Ver. 2.5 is supported.
Live view display when shooting movies is possible.
Thanks Matt for finding the links!