Leaking shaft fluid UPDATE
I took the bike in and they took apart the rear end. The mechanic cleaned up everything and simply refilled it. He said it was over-filled with the rear shaft fluid. The pressure build-up forced some of the fluid out past the seal and out the weep hole.
I mentioned that some of you had said it "can't be over-filled", but his point was the holding capacity was more than the recommended volume to fill.
After I got home, there were still a couple of drops coming out, so I will need to keep watching it and let you know what ends up happening. My bet is the seal needs replacing.