The Games Workshop release schedules have gone weekly, and with it a lot of what we are looking is hard to figure out for the future. However, there are some constants among the rumors, and some very solid information on what is coming after we wrap up April's Astra Militarum release. First up.... Wood Elves.
These are based off of rumors. These can of course come out much different, but this is the current line of thinking on much of it. Of course there is some debate still on new editions, but I am sure we will be getting more rumors and information as we get deeper into April.
Please remember that these are rumors.
Rumored Release Schedule
April-Astra Militarum, Militarum Tempestus (known)
May-Wood Elves and Chaos Marines (chosen, havocs)
June/July Orks and 7th edition 40k.
August Warhammer Fantasy 9th
September- New 40k box set