Hopefully, LR did have that gap, but then again it wasnt a game of huge importance. Square Enix is definately getting a lot better at getting games out on time now.
They did the same for other FF games though, they said the demo is to generally get the idea across much better than a trailer would, they could probably make it to Christmas 2015 if they pushed hard enough though, I generally hope this has a worldwide release, since the western market is now much bigger than the eastern market.