Announced almost exactly a year ago, the Olympus E-5 replaced 2007's E-3 model as the company's flagship SLR camera. The E-5 is based around a 12.3 megapixel Live MOS image sensor, Four Thirds lens mount, and 3.0-inch tilt/swivel LCD panel. It offers dual Secure Digital and CompactFlash Type-I card slots, and draws power from a BLM-1 lithium ion battery pack.
Like the previous v1.1 firmware, which tweaked the camera's behavior to remember the LCD monitor's color temperature setup after a power-cycle, the new firmware has but one change intended to improve useability. Olympus E-5 v1.2 firmware changes rotation of the rear-dial on the optional HLD-4 portrait / battery grip to match the AF target's movement direction. (Exactly the same change was made, among others, in the initial v1.1 firmware for the earlier E-3 model, issued a little under four years ago.)
More details can be found on the Olympus website.