If there's a 2013 Ork Codex, I mean, we have:
Tau, Eldar, Daemons of Chaos, at the least, who are rumored to come out in 2013, not to mention other things rumored in 2013:
Lizardmen, High Elves for Fantasy,
Codex: Space Marines, Sisters of Battle, Black Templar (though I have a feeling they are going to be rolled back into Codex: Space Marines >.&
gt
And we don't have enough details about the Ork Codex to determine what models are going to be removed. They tend to keep a lot of popular models in production (atleast by mail order) so that people can get a cool looking model (and they can continue to make money off what they have).
I mean, heck, they redid the Tau Stealthsuits from last edition in Finecast, I can see them keeping things they've already shifted over to Finecast.
I mean, 5 codices/army books if you include Lizards and Elves for Fantasy, and that's a pretty darn busy year for G-Dubs. I guess 6, technically, since they do 2 books for Chaos Demons.