Starting this month, the first court case since Proposition 8 was passed in California is going to be heard at the San Fransisco district court. Two gay couples, Kris Perry and Sandy Stier, and Paul Kattami and Jeff Zarillo, are the ones who filed the case, and they are represented by Ted Olsen and David Boies. I'm sure we'll be hearing a lot about this case in the coming months.
Over 30 states have specific bans on gay marriage, and if this case goes anywhere and accomplished legal action against Prop 8, it is quite possible that many other states will follow suit. The case argument is that it is unconstitutional for a state to ban gay marriage.