On 13 Jan 2010 Olympus released a firmware update for the PEN E-P1. From what I have
been able to find out this update improves the MF Assist, making it faster and easier to use. It also enables REC View when the LCD backlight is set to zero.
This update version 1.2 includes update version 1.1 which improved the operation of the camera in Continuous AF mode.
You can find the update here at: http://www.olympus.co.jp/en/support/imsg/digicamera/download/software/firm/e1/