According to TokyoGraph (from an article on Sports Hochi), Stereo Pony's next song "Namida no Mukou" (泪のムコウ - "Facing Sympathy"? idk) will be used as the theme song for "Mobile Suit Gundam 00" starting January 11th, 2009. Amazon says the single will be released exactly a month later, on February 11th.
I'm not a fan of either anime they've had tie-ins with, but damned if I don't love these girls. Their first single was ~*amaaaazing*~, so I'm super-excited for this next one. That, and SMJ tends to treat their artists right by letting them release more than once.
Will keep you posted as samples become available!
[SOURCE1] // [SOURCE2]