Kevin Durant (and everyone else) knew an offseason trade was coming after the Suns had discussions with the Warriors before the February deadline. The Houston Rockets were listed as a potential destination, but there was some reluctance on their part about going "all-in" on a 36-year-old (who has since turned 37). It turns out they didn't have to, as the Rockets came out of the deal with the upper hand.
The regular season hasn't started yet, but it's been made clear by Durant that he's exactly where he wants to be. He said at media day that he sees himself signing an extension with the Rockets, as he's entering the final season of his current contract.