In the tangled web of Prop8 (See graphical timeline), the Federal District Court found that it was unconstitutional. The prop8 supporters appealed. However, because the state refuses to defend the law, there was some question as to whether the supporters had the RIGHT to appeal.
The (federal) appeals court sent a question to the (State) Supreme Court, asking if under California law, there was such a right.
The state court today said, yes, the supporters can appeal.
So now the Federal Court will consider whether they have the right to appeal under FEDERAL law.
So nothing changes. Prop8 is still in force.
And the lawyers continue to argue on a perilous course towards the US Supreme Court (SCOTUS), which dominated by unfriendly conservatives. At some level, this case was never about Prop8, but a test case to take a risky strategy to try to change federal law. I'm sure Olson and Boies are happy, because they want to make it to the SCOTUS. But gay Californians still can't marry.