Composite Ver. Ka is indeed an expansion from the G.F.F. and G.F.F.N. series.
140mm tall. Made of ABS, PVC and POM. Comes with various weapons, option hand units and a display stand.
June release, 5,040 Yen (inclusive of tax).
Also, a tiny thumbnail of the next release in the series, Gurren Lagann is shown as well. It's way too small to make out of any details actually. ^^;
Release date and price TBA.
Images are from Tamashii Web.