My rough draft plans are as follows -
September - Dark Ages. My goal is to finish up my Anglo-Danes, Vikings, and get a start on my Picts and Welsh.
October - Zombtober! I've got loads of zombies primed and ready for paint, and loads more awaiting assembly and paint. Will probably work on a lot of post-apocalyptic stuff during oct as well, as I'm expecting Across the Dead Earth KS stuff to arrive any day between now and Oct 31st.
November - Roman Invasion of Britain project that's been in the works for over 2 years now. Roughly 200 1/72 plastics waiting for finishing.
December - 6mm ACW. I have close to 2000 figures that need painted, and I'm planning on putting gods own scale (according to Peter Berry) to the test.
January - WWII. I've got armies for Germans (both early and late war), Brits, Japanese, Americans, Polish, and Russians...with misc. Finns, Italians, and ANZACS - in scales ranging from 6mm to 1/32. I expect my Dad and brother will be jumping in on this.
February - Force on Force project. I have been collecting forces for a couple of campaign ideas for FoF for awhile now - a 2nd American Civil War set in modern times, and a British Civil War set in the 1970's-1980's...maybe controversial...the plus side is, all these figures can and will be used for - Modern Iraq/Afghanistan, Falklands War, A soviet invasion of Western Europe etc.
So, that's the rough plan. We'll see how well I stick to it. Terrain is also a goal for every month.
Something I'd like to see anyone who partakes in the challenge do is at the end, ie March 1st of 2015 - gather everything you've finished, and take a mass picture. I think it'd be cool to see everything compiled together!
Anywho. Good Luck!