But isn't this common knowledge since Halo 4? 343i announced early on that this is the reclaimer trilogy and was laying the groundwork for both Halo 5+6 when number 4 was released. I hope part 6 comes in 2018, giving them time to make the most of the end of this trilogy and keeping the pace of about 3-4 years between each release.

Woah, what a way to introduce myself. I've been on this site for a while, lurking in the shadows. Always felt this community was more open to discussions so I really like to visit here often more than IGN or Gamespot. So yeah... Hello

Now on topic: This isn't really uncommon practice and it's not just 343i either. Halo 5 technically started development back in mid 2012 before Halo 4 released. It's all because of the designers, writers and artists. At the end of production it's all about polish and that is up to the programmers. The designers, artists and writers don't have anything to do at that point and since we already know that they plan to keep Halo around for a while, they might as well start spawning ideas for the next game. From other sources I heard this story from they just started working on how the story will go. And since it's part of the next game, it's technically in the development phase. Unless they plan to just leave the gameplay as it is in Halo 5, they probably don't even have a design- or possibly even a concept document 

I'm not an industry expert, right now I'm studying to become a game developer so I just learn this stuff from other developers. It's really not that uncommon for big studios to start development of new games before their current projects are released.

I don't think 343i is rushing as they had a ton (3 years) of development time. Still, Halo, Gears, Forza lol MS needs some of their first parties to develop new IP's. Save the next Halo + Gears for the XTwo.

and forza horizon 3 as well.

Most people (especially on forums) know nothing about game development and it shows... sometimes when it's so hilarious it's sad...

This thread has people who knows what's going on and those who don't have a clue.

Also Vgchartz already plan ahead as well: http://www.vgchartz.com/game/72909/halo-6/

Uncharted 5 is debatable.

Uh...yeah. It was called the reclaimer trilogy when Halo 4 came out. 343 had 3 years to make Halo 5. Why can't they have the same to make Halo 6?

Also, looking at this video, Halo 5 looks to be a masterpiece in optimization. Smooth 60fps in an early build is great to see. But no one wants to mention that.

Yeah halo 5 is shaping out ot be the best halo ever. I am very hyped for it