I think I'm going to go for it. Though I hate having unfinished things when I start something new. I need to finish a short story I'm on atm and the novel, from which I took a break to write the current short. I would really like to have those wrapped up before I try to start Nano.
I think I'm going to use it to write a rough draft of my fantasy trilogy (maybe quadrilogy) that I've been wanting to write since I was in middle school. It was next on my list, after the current novel, anyway. But the novel WIP kind of burned me out and I had to take a breather from it to write something in the real world. It's been a nice refresher. Hopefully I will be able to get back to the novel and finish it before Nano.
If not, it can just wait longer.