From The Foundry site:
We are very pleased to announce that NUKE 4.7 is available to download now.
This maintenance release of Nuke 4.7v1 features FrameCycler Professional 2007, an improved curve editor, an upgraded version of Primatte, a brand new optical flow engine, OFX plug-in support and many bug fixes.
http://www.thefoundry.co.uk/
Barry Berman
3Dmation Visual Effects