When will the Green Lantern movie trailer be released?

Does anyone have any idea when the trailer for the upcoming Green Lantern movie will be released in cinemas and/ or on the net? I've been waiting to see it for what seems like a lifetime and I know there is one out there (as it was shown at Comic-Con this year).Since the film itself is out in little more than 9 months I'm really surprised they haven't even released a teaser trailer yet.