"We just learned from inside sources that developer Factor 5 has officially closed their doors as of today," reads an e-mail that was sent to, and reposted by, IGN editor Matt Casamassina. "That's some pretty big news considering that those guys have been around for quite a while."

Factor 5, founded in 1987, has yet to issue an official statement on the matter. The developer was known to be working on a number of multi-platform projects and dedicated Wii games, one of which was strongly rumored to be a Superman title.

"Things are obviously in flux and we hope that the game proves to be as indestructible as our hero," Factor 5 president Julian Eggebrecht commented after publishing partner Brash Entertainment unexpectedly shut down earlier in the year.