Five years to the day after the announcement that John Romero was departing id Software, we find this tidbit, straight out of the new issue of Next-Generation magazine:

ION CLOUDS:

John Romero and Tom Hall are at it again. The two founders of ION Storm may have completed work on Anachronox and been all but banished from their Dallas-based, 54th-floor ivory tower. Still, the two are collaborating on a new PC game and shopping it to publishers, including Eidos. According to sources, the game is being described as Sin meets Rollercoaster Tycoon meets Age of Empires. It's being planned for Xbox and Game Boy Advance.