SS #5 was estimated at about 22k, not taking into account digital sales (because Marvel doesn't release those). I'm assuming since SS wasn't cancelled at #6, that for trade purposes, it will go to #12. I may be wrong. It could go to #10 for all I know, or #16+ if sales plateau. I'm mostly going by the patterns I usually see. Books that go below 20k get cancelled, but those that plateau above that usually get to go on, like Peter David's X-Factor, that hovered at 20k for more than a year.
As for Robinson referring to crossing over with an Avenger book, could he have been talking about the Civil War II tie-in in #9?
Gotta say, guys, my faith is slightly renewed upon hearing this news. I'm really pulling for Robinson to make up for SS #1.