There is a comet that promises to be a good one now visible in the early morning in the constellation Bootes. It is predicted to steadily brighten through December and travel from one end of Ursa Major to the other. See the C/2012 K5 thread in the SS Observing forum for more details. And remember--comet predictions can be unreliable.
The comet was easy to spot in my low power wide field eyepiece at 75x. I pumped up the magnification for the sketch just so I could see if there was anything to see, but it's still pretty small. We'll keep our fingers crossed.
I did the sketch at the ep with a 2B pencil on Strathmore paper, adjusted the gamma and levels a little bit, added a little blur, and flipped it digitally to get the correct view.
Good luck if you decide to go for this comet. Since it's a morning comet, you'll be racing the sunrise, so you can't linger.