According to the japanese website DC.watch.impress.jp Olympus will soon release a new version of the E-P1 firmware.
E-P1 Firmware Ver1.2 has incorporated the following changes in.
* MF Assist enlarge time to change, and improved operability.
* Even if you set off the backlight of the LCD monitor, enabling the shutter.
UPDATE: Here the official Olympus news: http://www.olympus.co.jp/jp/support/cs/DI/fwdl/e1/ep1.html