This list starts with what has already been released, flies into and past the present, and heads off into uncharted waters. With 2 codexs a year, a list like this would put eldar out into 2014.
via Isotope99 (who has given us good rumors in the past)
Space Wolves
Tyranids
Blood Angels
Dark Eldar
Grey Knights
Necrons
Sisters
Tau
Black Templars
Chaos Marines
Dark Angels
Eldar