Don't expect Halo 6 to be shown during Microsoft's E3 2017 event.
343 Industries community manager Brian Jarrard reiterated Spencer's comments over on reddit, stating that while the studio will have "a little something at E3" for fans, "it's not related to the next major entry in the franchise" (thanks Gamekyo).
It's quite possible 343 could be teasing a Windows 10 release for The Master Chief Collection or Halo 5, considering Halo 6 will hit PC - you never know. We'll have to wait and see what happens when Microsoft's presentation kicks off at 2pm PDT/5pm EDT/11pm.
And when Halo 6 finally does release, we expect it to focus more on Master Chief's story, because Halo 5 was a "huge disappointment" to fans in that respect "because they wanted more Chief.”
“Doubling down on Master Chief story and the amount of focus on him was probably the easiest learning from Halo 5," said franchise director Frank O’Connor in April. "That was a really simple thing to absorb and embrace."
Expect more Master Chief in the future, then.