Do we know anything particularly useful, like a release date or plot? Nope. All Kojimi-san said was that it’s coming, it’s a whole new experience, and then the disembodied voice yelled something like “Raiden is back!”
Now we being months of speculation. How much did Microsoft throw at Konami to get the game? What does this mean for Sony and the PS3? What does this have to do with Project Natal? Etc.