http://www.goprocamera.com/support/hdheroupdate.php

One Button Mode

One Button Mode simplifies recording video and photos with your HD HERO. With
One Button Mode, your camera will start recording video or photos automatically
when you power the camera 'ON' and will only stop recording when you power the
camera 'OFF'. The shutter button is deactivated in One Button Mode. You can only
turn the camera on and off, making it the perfect setting for loaning it to
friends or newbies.

Upside Down Mode (UPd)

Now you can take videos and photos with the camera mounted upside down without
having to rotate the files later. In Upd, all videos and photos will be saved to
your SD card right-side up.

Live Feed Out

Display live feed SD or HD video and audio straight out of the camera to a TV,
handheld viewer, or video transmitter. Allows viewing a live video signal during
preview, recording, and playback of saved files.

Live Feed On-Screen Display

Display battery life, camera mode, and recording status icons on your live feed
video signal with 'On Screen Display' turned on, or turn it off to transmit only
the video without any status icons.

PAL 25/50 fps Support

If you live in a PAL region (most regions outside of North America) you can now
record in the PAL broadcast standard of 25 / 50 fps in the following
resolutions:

r1 WVGA 50fps

r2 1280x720 25fps

r3 1280x720 50fps

r4 1280x960 25fps

r5 1920x1080 25fps