NV News posted some information about NVIDIA's upcoming ForceWare 80 drivers. A beta version of these drivers recently leaked and here's the changelog. One of the biggest improvements is mix and match SLI which will enable you to pair two NVIDIA cards from different vendors.
Additionally, the number of games optimized for SLI has now been increased to 150.
TV-out / HDTV-out support for even higher resolution gaming support Mix and match vendors - for example, pairing an SLI supported graphics card from MSI with one from BFG or XFX Mix and match framebuffers (via Coolbits) - pairing a 128MB graphics card with a 256MB graphics card Ability to enable vsync for all Direct3D and OpenGL games Dynamically enable/disable SLI - rebooting is eliminated! Primary Display Switching Auto Display Detection Linux Support