It's crawling closer to the release of Super Mario Galaxy 2, with less then two months till its release in European territories. If that's not enough to get you excited about the game, then to help get you even more excited, Nintendo have released a fourth trailer for it.
The new trailer shows how the recently talked about Co-Op gameplay elements work, as well as Mario's new Cloud suit. That's not all though, with a surprise ghostly Roslina making an appearance, which seems to be part of the new guide system. This is presumably there to help players, in a similar way to the 'Super Guide' in New Super Mario Bros. Wii.