It has been confirmed by Craig Thomas and Carter Bays, the executive producers on How I Met Your Mother, that the bride of Barney (Neil Patrick Harris) will be revealed in the forthcoming seventh season of the show. They did however refuse to say whether or not it would be any of the current cast.
Bays explained, "Don't assume we are beyond or above doing a little bit of Mamma Mia in season seven. There will be some [other] choices." While Thomas added, "We will meet who Barney is marrying in season seven. We're not going to string that along. [The identity of the bride is] the big central question, though there are many, many new questions."
How I Met Your Mother was commissioned for its seventh season back in March, when it was also confirmed that they would be extending to an eighth season. Season seven of How I Met You Mother premieres on CBS on September 19.