He heals the land by killing boss guardians, in the style of Shadow of the Colossus or Twilight Princess, and unleashing the power of the light-wells they guard. The land is then transformed in real-time - unlike Okami's cut-scenes - with grass growing and lighting and colour changing dynamically as the Prince moves through the world.
Although combat is still an important part of the game, enemies will be much less numerous and more vicious. The emphasis is on one-on-one swordfighting duels, with a very dynamic camera. It's described as being more Soul Calibur than God of War.
The new Prince of Persia game's out for PC, PS3 and 360 this year. Expect to see more from Ubidays at the end of May.