Eventually there will be one, but probably not in the United States. You'll probably have to import it.
They already made a rugby game for the PS3 and it was released in America!
Preferable from 2K if not from Trublu Games. EA can't make a sports game to save their life; save for NHL.
Edit: Updated label & subject title. Please click here to learn more about labels. -Super_Nova2k13
Though rugby is a great sport (some cable channels in the US air rugby matches, mostly from Australia) and I enjoy watching it, i honestly don't think it would be successful as a video game given the fact that rugby is not popular in all countries. The same goes for lacrosse and cricket...it's still a good idea, though.