The Rabbids uses a time machine (which looks like a washing machine) to go through different times to change the history of time, first they go to caveman times to help a caveman discover fire, but end up giving him a lighter. Then they go to middle-aged Egypt to disturb work on the shpinx and make the nose fall off. And last, they go to Medival times but they end up underground holding a sword when arthur tries to pull it, when they leave, Grannie ended up pulling the sword instead of Arthur.
Gameplay will revolve around several minigames for up to four players (with computer AI controlling unused players) set during various segments of time. Some levels will feature co-operative play, such as a level where two players are tethered by toilet paper. Ubisoft has stated this game intends to be 'waggle-free', and rather than having games shake the controller as hard as they can the designers hope to create mini-games with more depth.
Source: Wikipedia, "Rayman Raving Rabbids: Travel in Time," available under the CC-BY-SA License.