To put an end to fan's speculation, this is Jon Hogdson officially speaking (writing?) on the C7 forum:
"Good morning!
To clear up some confusion:
We're taking a modular approach to the rules sections and soaking the accompanying cost ourselves. So you will get rules for both systems, and you'll be able to remove the rules section you don't require, and rest easy knowing you paid no more for it.
So let's say (for example) Moria is a box with 4 manuals in it. One will be the rules for TOR and one will be the rules for AME. You'll be able to throw one away/give it to a friend who has different tastes in rules. The price will be for a box with 3 manuals. Because as I said, we have your back. But we also want to make a Moria boxed set.
We have no plans to convert any other forthcoming title to "dual stat", and we've never used that term officially. I have personally made it clear I dislike "dual statted" products. AME and TOR remain seperate lines as we have always said".
http://forums.cubicle7.co.uk/viewtopic.php?p=71794#p71794