There's already been a bunch of leaks of this, but official information on Zero-One's theme tune has now been released.
Am I the only one who thinks it sound like part of the soundtrack to 'Outlaw Star'?
The theme tune is called REALxEYES, which they are insisting is pronounced "realize". It's being performed by 'J' from the band Luna Sea along with TM Revolution (which is not a band but one guy who's really called Takanori Nishikawa).
Luna Sea previously performed the theme tune to 'Mobile Suit Gundam: The Origin'. TM Revolution has performed a vast array of theme tunes, including Thunderbolt Fantasy, Mobile Suit Gundam SEED, Valvrave the Liberator, and Rurouni Kenshin.
Curiously, one year ago the first release of Zi-O's DX BeyonDriver toy featured an in-package advertisement for the theme tune "Over Quartzer", which stated that TM Revolution was going to perform on that song. When the song came out ISSA was performing it instead, but it seems that TM Revolution has finally landed the gig.