My point is, you need to look out for number one and not let some law firm looking for (their own) payday get you entangled in their profits, because none of them give a fuck less about you.
So without more clarity on which laws were broken and your role in this (are you the primary witness? Sole witness? One of a dozen?) it's hard to give specific advice.
But just don't let yourself get screwed because some lawyers see a payday they damn well aren't going to share with you.
ps -- if you get a subpoena, get your own lawyer. Maybe even get one now; a lawyer's job is risk management and that's what you need.
ps2 -- Depending on what happened, when people ask, "What kind of person do you want to be" the response might be, "The sort who has a career and can afford indoor living." Here's another whisteblower about mortgage fraud who has destroyed her career [1]
[1] http://www.rollingstone.com/politics/news/the-9-billion-witn...