Via Reduser comes this note on new features for Kona card users:

“…AJA Video is adding RED-specific video outputs for some of the unique frame sizes that the REDALERT and REDCINE software applications can produce. This additional support for RED will be included in the version 6.0 software driver for the award-winning KONA 3 video card. The version 6.0 software update will be a free upgrade for KONA 3 users, and will be available for download in late May of 2008.”

The following frame sizes will be offered as video playback options within the
Apple Final Cut Pro>A/V Devices tab in Version 6.0 of the AJA KONA driver software:
2K
* 2048×1152 - outputs the image to 2048×1556
* 2048×1024 - outputs the image to 2048×1080
Note: These 2K frame sizes can be output to either a 2K DCI spec projector or to a 1920×1080 HD video monitor using the AJA KONA 3 real-time 2K crop feature.

1920×1080
* 1536×864 - outputs the image to 1920×1080
* 1536×768 - outputs the image to 1920×1080
* 1024×576 - outputs the image to 1920×1080
* 1024×512 - outputs the image to 1920×1080
This real-time image output automatically centers the picture and fills the rest of the frame with black.

More info at aja.com.