IT'S OFFICIAL!
Apparently this came with the Lagann-hen DVD, which some people in Japan have already gotten early.
GURREN LAGANN PARALLEL WORKS 2!!
"This time, it won't be just BGM used in the show,
but new BGM and character songs will be created simultaneously!
Participating creators will be announced soon!!
TO BE RELEASED SPRING 2010!!"
*SCREAM*