Red Giant Software has pre-announced their NAB announcements:
Colorista Free. Colorista II is a great color grading plug-in that works with Adobe After Effects, Premiere Pro and Apple's Final Cut Pro. Think of it as a step up from the Final Cut three-way color corrector, without the confusion of Apple Color. Colorista Free is a sub-set of the Colorista II plug-in, available for free! No word on availability or what feature set is implemented.
LUT Buddy is a free tool for sharing Look Up Tables.
[UPDATE Both are now available for download here: Two New FREE Tools for Color Grading & Color Decisions]
Magic Bullet Grinder 1.5: a free update to this Mac tool for converting DSLR footage. Three new options for time-code, and two new main codec formats ProRes HQ & LT have been added and support for conforming from 30p to 25p (it already supports 30p to 24p)
Also, Guru Preset Packs, and for the iPhone, Magic Bullet Movie Looks and Noir Photo.
Red Giant: NAB News: What’s New at Red Giant
[UPDATE: Added link to download page for Colorista Free and LUT Buddy ]