Basically an update for a couple of new cameras and as usual I recommend that you update to the latest version, you never know what little tweaks were done under the hood. You also need this update for the Lightroom 2.3 update.
Support for the following cameras has been added in this update. Visit the Camera Raw page for a complete list of supported cameras.
- Nikon D3X
- Olympus E-30
Adobe Photoshop CS4 Upgrade