From TV Guide (May 2012):
"It had to be Robin."
That's what How I Met Your Mother co-creator/showrunner Craig Thomas says about Barney's big bride reveal on Monday's Season 7 finale.
"There was just no other way," he tells TVGuide.com. "We always knew it was gonna be Barney (Neil Patrick Harris) and Robin (Cobie Smulders)."
Q: When did you and Carter [Bays] decide that Barney and Robin will get married?
Craig Thomas: We decided literally years ago. As we were breaking them up, we knew there would be a rekindling and that wouldn't be the real deal ... and we would reveal them to be the groom [in the Season 6 finale] and bride now. ... Season 8 is gonna be filling in the steps between Point A and Point B. We know they do get married, but there are a lot of steps between Point A and Point B....