Sierra officially announces PROTOTYPE, an open-world game in the works at Radical Entertainment for release next summer for PC, Xbox 360, and PS3. There are some screenshots on Team Xbox, and here's the announcement:

Sierra Entertainment and Radical Entertainment Raise the Bar on Open-World Games READING, UK (10th August, 2007)– Sierra Entertainment, a division of Vivendi Games, today announced PROTOTYPE™, a completely new kind of open-world game, featuring a rich story line of conspiracy, deception and deadly shape shifting action.

Developed by Radical Entertainment, a critically acclaimed developer of open-world games, PROTOTYPE tells the story of Alex Mercer - a man haunted by his past, fighting a secret war in New York City. As the action spirals out of control, a conspiracy tied to his origins threatens the future of mankind itself. Mercer’s amazing shapeshifting powers allow him to become an exact replica and steal the skills or powers of anyone who crosses his path.

PROTOTYPE debuts on the PLAYSTATION®3 computer entertainment system, Microsoft's Xbox 360™ video game and entertainment system and PC in summer 2008.

“Radical Entertainment has a strong pedigree of critically acclaimed, best-selling open-world games, and Sierra Entertainment is excited to see them craft an original game that has already fired-up the imaginations of press and gamers alike,” said Martin Tremblay, president, Worldwide Studios for Sierra Entertainment.“PROTOTYPE represents the strength of Sierra Entertainment’s internal studios and our commitment to creating original and exciting games.”

“Radical Entertainment set out to create the most dynamic video game character ever imagined. From free-form movement to over-the-top combat action; PROTOTYPE can climb or wall-run across any surface, jump 30 stories high, and destroy anything that crosses his path,” said Kelly Zmak, president of Radical Entertainment.“Our team at Radical has built upon the technology that drove our previous best-selling games and now has the freedom to dream big and imagine a powerful character in a sprawling city like New York, cloaked in a conspiracy and ripped from today’s headlines.”