God of War's obviously a long way from being complete, but director Cory Barlog has confirmed on Twitter that it's playable from start to finish. This means that all of the title's features and content have been incorporated, and the team now needs to spend the remainder of the development cycle tuning, polishing, and fixing bugs.
We're obviously simplifying things; there's probably still a whole lot of work left to do. But as Barlog himself tweeted, this is a "very exciting milestone". So when will the reboot drop? You're probably still looking at 2018 if we're honest, but this all but confirms that we'll be seeing a lot more of the project in the New Year.