Under Siege is being developed exclusively for PlayStation3 and will be available on PSN between late April and early May depending on your region. The title is Real Time Strategy IP which supports PlayStation Move. Developer, Seed Studios say the built-in editor is one of Under Siege most brilliant features which allows players to create their own maps and game modes.
From the press release:
GATHER YOUR ARMIES AND FIGHT!
Under Siege is an action and strategy game in real time, where a small group of heroes fight against a huge invading army. The game is set in a medieval fantasy world and follows the story of Eirik, Kari and Asgeir. Designed to be played with the DualShock 3 controller or the PlayStation Move motion controller.
Under Siege will cost 14.99 Euros, 11.99 pounds, 19.99 or around R180 depending on your region.