Set in the five-year gap between the original Ben 10 series and Ben 10: Alien Force, Ben 10 Omniverse will advance the Ben 10 story through regular content updates. Characters will be based on skills and DNA rather than classes, allowing for deep character customization.
Ben 10 Omniverse will be suitable for players ages 7 and up. There is a sign up page for the game's beta here.
(It may be interesting to note that the company producing the game, Turnout Ventures, also has a Tom and Jerry MMORPG in the works!)