I think they'll probably do it for other games as well. It was a good format to use for communicating game progress imo.
Absolutely agree.
While the marketing and advertising of FF15 has been a pretty big mess, its hard to argue that they haven't been rather open about mistakes, potentially shady stuff (like the CG usages from back in 2013) and game progress and what that means in the grand scheme of things.
Fix a few things regarding how to show stuff like screenshots and trailers, and this system could very well turn into something that should be a standard.