Eidos Interactive and Crystal Dynamics have announced Underworld, the sequel to Lara Croft Tomb Raider: Legend. The game is scheduled for release in 2008 for PC, Xbox 360, and PlayStation 3. Tomb Raider Underworld is set around the ancient Mayan calendar.
For detailed information: Tomb Raider Chronicles.com Underworld Microsite
News source: Tweak Guides Forum