Is it true that they are making a Back to The Future Sequel?

From what I read online the basic storyline is that the flux capacitor is what gives Marty Parkinsons disease and in the future they find the cure but need to bring it back to 1985. I think its cool that Michael J Fox can find a way to still act with his disease and even use it in the storyline. I have seen that its supposed to be released in 2012. Can anyone confirm this?