The collaboration was announced by Nintendo, though the details end there.
This morning, Satoru Iwata announced that a new project was in the works for the 3DS. He didn't say what the project was or show screenshots or a trailer or even reveal the name. What he did say though, is enough to create a huge amount of buzz. The upcoming title will be a collaboration between Capcom, Namco Bandai and Sega.
The trio have launched a teaser site that tells us very little, but does involve a series of numbers that someone on the internet will certainly figure out quickly. When the site first launches, we see a hand punch in numbers on a keypad - 032760.
Theories abound as to what the new title is, from something as simple as a game collection to a mashup fighting game akin to 'Super Smash Bros.' Whatever it is, we hope to find out more soon.