Larry over at BoLS has posted this update of the army releases for the next year.
Games Workshop has obviously made a commitment to release new armies every quarter, as evidenced this past year. This is great for us gamers, and good for GW's quest for more profits (like every other corporation in the world, well, except for Costco).
And since the price increases we have seen from GW over the past few years cannot continue (the majority of gamers have significantly slowed their purchasing because of the increases) GW needs to rely on new armies to sell, as much as bringing in new gamers.
And for us hard core gamers, new armies are always good news.
So here is what Larry posted:
December/January: Tyranids
Q1-14: Imperial Guard
Q2-14: Orks
Q3-14: Space Wolves
Q4-14: Dark Eldar
You should treat each quarter as less reliable than the one preceding it. Based on this list the following codexes would not have updates.
40K:
Blood Angels
Necrons
Grey Knights
For information on WHFB, check out Larry's complete article here.
So what we see is a LOT of armies coming out this coming year and every army will have a new codex by the end of 2015. It also means a ton of new models.