Yeah, I wonder if they're already thinking about another trilogy.

Great, will make for a great game in holiday 2017. That's when I think it'll release.

So first your evidence was the fact that they have started working on the story of Halo 6. Now you're saying you have a hunch because of general gaming trends? Which general trend does Halo 5 fall into?  Because you have yet to say anything that actually points to this game being rushed.

I bet Halo 7 & 8 is already been on plan as well so Halo 6 would have some connection on the stories progress and i bet their time and production team being split into many small team to focusing on future Halo and current Halo, I thing that's what most of Halo fans feel suspicious with Halo 5 quality.

my bad for expecting they should've add what they had already plan for Halo 6 contents in Halo 5... 

They can't include anything from 6 into 5 because they haven't started doing anything for 6 other than writing though. What 343 are doing is basically what any other studio does. When Uncharted 2 was in the final phase of production a few months before release I doubt the writers and designers just sat around and thought "We wont do anything until UC2 releases otherwise we might as well have thrown it in at last minute in UC2", no they started developing the 3rd game.

A game has a set design document that might undergo changes due to constraints or because stuff didn't work out but they can't add stuff to it because it could fundamentally break what they've already made.

They're writers and maybe concept artists. They've been done for months. There is no single player DLC for Halo so of course they'll start on Halo 6. I see no Halo fans here actually suspicious with Halo 5's quality.

They have a large story to tell. Only natural that early elements of it are coming together.

I am sure when Avengers Infinity War part one is done filming they'll still be doing lots of work for part two. Not that the shitty Avengers movies can hold a candle to Halo.

They usually film Part 1 and 2 of movies at the same time for continuity.

Activision & Ubisoft: Bitch pls