It goes without saying that we expect every newer installment in a videogame series to achieve more than the last one and two of the usual measures of that the size of the game and frame rates although I personally believe there are more important features than those two.
In Halo 5 Guardians, the developers are also focusing on a lot of things to make the game better and when it comes to the length and size of the game, I think you can rest assured.
Not that we didn’t expect it, but Frank O’Connor from 343 Industries has confirmed at the San Diego Comic Con 2015 that the size of Guardians is much bigger than Halo 4.
It’s definitely, definitely bigger. And for some of the players in this audience, the [Halo] games do seem to be getting shorter, but that’s because you’re getting much, much, much better at the game as well. And if you’re like me, you’re going to grab a Warthog and drive it places it’s not supposed to go.
He also discussed the reasons why they chose 60fps over 30fps and the gist of the matter is that they believe “60fps is gameplay.”
O’Connor says that they would have opted for 30fps if the game was about visuals but Halo 5 Guardians is more about the speed at which stuff happens:
Our simulation, the way your controller works, the way that you move through the levels; the way that four players move through those levels; they’re all actually tied into a 60fps simulation. So the reality is, if it was visuals, what we’d do is we’d just overload everything at 30fps; higher fidelity textures and lighting and so on.
I believe any Halo 5 fan would agree to that reasoning.