http://www.animenewsnetwork.com/news...agann-tv-anime

a link on the bottom of that article also states:

The second, however, came entirely out of left field, to cheers and gasps of surprise from the audience. Aniplex and Bandai Entertainment will be bringing out the North American release of Gurren Lagann.
To get this highly anticipated anime out to fans as soon as possible,
there will be two separate releases. In July, August, and September,
the entire series will be brought out in a bare-bones sub-only format,
at nine episodes per DVD. This will be followed in the first months of
2009 by a more standard release, containing both the original Japanese
audio and a completely new English dub. Scenarios for online distribution are also being considered.