I'm not surprised by the next Halo game having microtransactions, but I hope they won't affect gameplay like they did in Halo 5. It was subtle, but people who bought credits and opened more packs than regular players were always able to use the best reqs in consecutive games, weras regular players would generally run out of the good stuff after a few games of going "all out" with their reqs.
It was pretty minimal though. I'm mostly just looking forward to the next campaign anyways. AND they're supposed to have local co-op again going forward, so we SHOULD see that return in this game.