ES hadn't say much about AoM's scenario editor, other than the fact that it will be much easier to use than AoK's.
By they way, speaking of an easy-to-use editor, I've made a post lobbying for a tutorial campaign that would teaches the player how to use the AoM Scenario Editor - things such as the basic features, options, and how to use them. Read more about it here. If you like the idea of having a tutorial campaign for AoM's Scenario Editor, please sign your name on that post and say that you would like to have that in AoM .