You'd have to talk to sarah_p though I'm assuming there isn't going to be one because wishlists would have been up by now. There's an email to contact her on the profile page.
Am I interested? Probably not. I did this twice and both times I didn't receive a gift. Then again I seem to have the worst luck with exchanges and that always happens, it's not just here. Though I'd be willing to help if your thinking of setting one up.
If there were one, it would have been set up by now (and people would have been already been making gifts), but I know that the last few years have been hard for everyone to get a gift (I think I also went without one for two years).
I just went one year without a gift, but it did seem like the problem of folks not coming through with gifts was getting worse. If the exchange were to happen, I'd drink up the fics like a person dying of thirst, but unfortunately, I wouldn't have the time to write anything myself. It's too bad--I always thought these were fun, but Christmas is such a busy time for me...