Except you are wrong, Indomitus to their first codex was 11 weeks, if we get a preorder announcement next week it will also be 11 weeks for us.
I don't actually think we'll get one next week as they probably will want to get all orks out first but right now AoS still isn't longer than 40k
What I want to know is how long it will take to actually get all model kits out after that