Oculus has released
v0.4.3 Beta for the SDK and Runtime, so make sure you upgrade! The biggest improvements seem to be a latency reduction in Direct Mode and Linux support. Personally I still can't get Direct Mode to work, but for those who can, this is probably a big improvement.
New Features Oculus SDKDisplay Driver latency reduction in Direct Mode by 1 frame, resulting in 0ms Post-present.
Updated display driver to support multi-threaded calls efficiently, this may improve performance in some scenarios.
Added option in the Oculus Configuration Utility to Suppress the Health and Safety Warning during active development.
Added option in the Oculus Configuration Utility to set the OVRServer logging level.
Updated the Health and Safety Warning screen to reflect an age restriction of 13. More information can be found in the Oculus VR Best Practices Guide and in the Oculus VR Health And Safety Warnings documentation.
Experimental Linux support (see included LINUX_README).
Numerous stability and performance improvements.
UnityAdded support for Unity Free in Unity 4.5.5 and up.
Overhauled Unity C# API. Reduced performance overhead. See the migration guide for more details.
Improved support for multi-layered rendering. Just instantiate multiple OVRCameraRigs, set Camera.depth and Camera.clearFlags for each eye, and use.
Bug Fixes Oculus SDKFixes in Vsync direct mode tearing.
Fixed a bug in the D3D10/11 rendering path that was causing the overall brightness of the visuals to change on some systems.
Improved OpenGL state management through contexts.
UnityFixed a source of jitter in TimeWarp timing that resulted in shaky images.
Removed problematic "out of camera range" message. Will be replaced by an optional camera bounds visualization in a future release.
In the editor, Game view rendering no longer targets the wrong view.