The DirectX SDK (February 2010) release is live on Microsoft downloads. See that page for full release notes.
This release contains:
- Improvements to PIX particularly for Direct3D 11 support
- a minor update to XNAMath v2.02 including some notable fixes for XMStoreColor(), XMQuaternionRotationMatrix(), XMVectorATan2(), and XMVectorATan2Est()
- Some updates to the Direct3D 11 Deployment for Game Developers article and D3D11InstallHelper sample for corporate networks
- A few API changes for XAudio2