Disclaimer: This is speculation. It is not a rumour.
The last release order we had here was:
August: Lizardmen.
September: Inquisitor. (Space Marines).
October: Space Marines. (Inquisitor).
November: Dark Elves.
December: The Hobbit.
January: Orks.
February: Dwarfs.
March: Black Templars.
April: Fantasy release.
May: Tyranids.
June: Fantasy Release.
July: Imperial Guard OR something big (judging by Apoc coming out in July).
So August was Lizardmen and September is marines with Templars. My idea would be the following.
Edit: Natfka has chimed in and said Orks will be in the Q2 next year, not this year.
October: Dark Elves November: Tyranids (Nidvember?) December: Hobbit
January: Dwarfs
Febuary: Imperial Guard?
March: Fantasy (Wood Elves?(
April: 40k release
June: New big fantasy release( to match Apocalypse
The large summer release next year I think will be fantasy ( was there not rumours of a new edition?). After this we don't know, although I believe Natfka had scattering reports of Blood Angels and Space Wolves.
So what do people think? I would like to see other peoples ideas on the matter!