It's probably going to be like HoW and TDB was. You'll have to go through at least some of the story to open up Nightfall. Weekly Heroic might be open at launch since it's now a new Strike Playlist like Dragon was before now. I'm intrested in if we can sit in that playlist like we could the other ones,or even the Legacy one now and still get some kinda rewards on completion. But as for me,I'm gonna jump into the tower,grab my six bounties and then hit the story and see how it goes