Half-Life 3 on the XBox 360?

BizidyDizidy writes "According to a slide taken from a spanish XBox 360 presentation, Half-Life 3 will be developed for the new system. Could this be the Halo of the next generation? Combining this with the reported 300 dollar price point and early release date, a rosy picture for XBox seems to emerge. Is a killer-app like HL3 enough to sway you to choose a system?"