There are some series (such as Daredevil) that won't be relaunching with Now. I suppose the Ultron War storyline could be something similar... it is just strange that a storyline like this, which involves the Avengers (who are deeply connected with the Now initiative) wouldn't be launched as a part of it.
I think the thing about Now to remember is that it isn't a reboot... previous continuity is intact so storylines like the Ultron War can still potentially be told.
What I really want is Slott's Destiny War!
Let me clarify. Whatever the in-universe event is that causes the new now teams to form, might have nothing to do with this story. We know the books are relaunching, but since it's not a reboot that hardly matters. I think the comments can be taken as meaning that the events resulting in the new Now teams might be unrelated to this story.