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40K 3rd and Fantasy 6th was the only time the games were both on a 6 year cycle. I believe that had more to do with changes in the company and design studio than it did with wanting to be on a cycle...

Which may or may not be a bad thing. Wood Elves, Beastmen, and Bretonnians would all benefit from any major changes in Skirmishers and Cavalry in 9th. Waiting to release some armies until the rules...

Due to the rate of releases from this edition, it would greatly benefit both the players and GW to wait until 2015 for 9th. They could then feasibly make the first Army Book release of 9th complete...

Back when I worked for GW (during the original release of the LotR game), the restrictions were explained as:
1. We can't use LotR to sell the other games, so if someone walks in and asks about...

I refuse to believe that GW will ever outright invalidate army/codex books with an edition change again. It simply isn't good business. It would also mean that the rules would change so massively...