FYI you should be able to start setting up a clan now through the Bungie.net forums.
Also, the current build of Destiny 1 shares a lot of similarities with what you saw at the Destiny 2 Gameplay Reveal. I would totally recommend picking up a copy with all the DLC, especially if you stopped playing before The Taken King. I see no reason why a clan of Battleborn players can’t start preparing for Sept now while they wait for more Battleborn news
I am also on the lookout for people that never got to experience a raid before, because I was really saddened to hear that only 50% of the playerbase ever got to do one.