Alongside Lightroom 4, Adobe has release the latest release candidate of Adobe Camera Raw. This not-quite finalized version of ACR v6.7 brings all the cameras and lenses supported in Lightroom 4 to users of Photoshop CS5, plus the Canon EOS 5D Mark III as something of a bonus feature. As usual, it is being released on Adobe's Labs site to allow feedback before its final launch.
Adobe Camera Raw v6.7 release candidate adds support for:
EOS-1D X, PowerShot G1 X, PowerShot S100, EOS 5D Mark III
FinePix F505 EXR, FinePix F605 EXR, FinePix HS30 EXR, FinePix HS33 EXR
D4, D800, D800E