Tim is producing 'Abraham Lincoln: Vampire Hunter', and Timur Bekmambetov is directing (he also directed 'Night Watch' and 'Wanted').
It's based on a fictional book sejak Seth Grahame-Smith (who is also screenplay writer for 'Dark Shadows').
I have read the book, and I really liked it. I believe it's based on real events, but is manipulated throughout the story, making it fictional. XD
link link Not much else is known about either movies, since their only in early stages, and Tim's currently working on 'Frankenweenie'.