It's an interesting question but it breaks our current understanding of physics, I mean. There's really no possible way of knowing what would happen since anything going faster than the speed of light shouldn't be possible. But yet, I'm fairly certain that I read something in the big bang - discovery thing the other day, that the reason it was detectable was because for a very short time after the big bang, the universe was expanding faster than the speed of light, or something like that, and that caused some kind of ripple effect. So, ehh. :P