Really nitpicking here, but Pages '13 still has Applescript support. There are still a few things you can do with it. The sad thing is that Apple removed close to all the useful commands.
If I may speculate... (Yes, I know that I may not according to the rules of the forum, but let's pretend I did not read them.) If I may speculate, I would guess that Apple will reinstate a lot of the lost Applescript support. Apple removed a lot of Pages functionality in this version, and I am not overly optimistic that any large parts will come back. However, when it comes to Applescript in particular, I guess it was not a high priority for the radically new version 5.0, but that it will be fairly easy to add in a later update. But that's just my guess.