Well this is weird. At some point, Five Nights at Freddy's 4 was set for Halloween and had a subtitle 'The Last Chapter'. It was then moved forward a few months to August recently, revealing a new home location for the series.
Now it has all gone out the window as the game was stealthily released on Steam today. It no longer has The Final Chapter subtitle either, so I assume that means we can expect more games from the series.
The sequel is available for £5.59 on Steam and I haven't yet had a go at it. It will be interesting to see what the home invasion aspect brings to proceedings.