This stuff about the story indicates its indeed soft reboot. Easier to jump in as a new player. Wich is a good thing.
Halo Infinite takes place well after the ending of Halo 5, with a rampant Cortana nowhere in sight and the Master Chief adrift in space. The Pilot (as seen in the E3 2019 presentation trailer, which 343 reconfirmed to IGN is the very beginning of the game) then discovers him.
"Chief and the Pilot are in exactly the same position as the player when the game starts," Crocker said. "They don't know what's happened. They're learning what's happening, together." Lee told us that the new Xbox Games Showcase demo takes place roughly four hours into the campaign, which he said is "several times larger than our last two campaigns put together," referring to Halo 4 and Halo 5.
Players fight The Banished in Infinite – a rogue faction of Brutes (along with plenty of familiar Covenant Elites and Grunts too) who were prominently featured in Halo Wars 2. The team at 343 is quick to note that you won't need to have played that 2017 real-time strategy game to feel comfortable in Infinite ("It's not required reading," Crocker noted), nor will you have to consume the comic books and novels of the larger Halo universe in order to understand what's going on in the new game – a criticism of Halo 4 and 5 that 343 acknowledged. "We don't want a game where players have to do homework to enjoy this game," Crocker said. But why The Banished? "Because they're super cool and everyone likes them," he said with a laugh, before more seriously adding that the team wanted "to have something that's an evolution of the Covenant so you get some of the familiar, but something that's different [too], and it comes together to feel fresh."
"We want places to go and we want new mysteries." Lee added, "It's setting the foundation for future storytelling as well as tying some of those threads from the past. You don't need to go through the whole franchise to learn and understand the fiction coming in, but if you do have that knowledge we want to reward that. You'll see these [extended universe] elements and nostalgic moments. There have been a lot of goosebumps in the studio as we have [finished] different scenes and things that are in the game."
"What you saw in the montage at the end was us setting the stage for the journey the Chief and Pilot have been going through."
That ending sequence also introduces us to the villain of the story: a Banished leader named War Chief Escharum, who is the leader of The Banished on this Halo ring and "is connected to The Banished in a fundamental way," according to Crocker, and proclaims this Halo ring as his last stand, knowing that Master Chief is coming for him:
Halo Infinite Villain and Story Details Revealed - IGN
Halo’s next-gen spiritual reboot attempts to tie up old threads and create new storylines.
www.ign.com