Ted is conflicted when Victoria approaches him on her wedding day and asks him to elope. Meanwhile, Barney and Quinn are arrested by airport security while on the way to Hawaii when Barney refuses to open a box they are travelling with.
At the end of last season and the beginning of last season they began to "announce" an upcoming wedding. Now the season is over and they still haven't told us who is going to get married.
The scene looks very much like the one where we saw Barney as the groom, so you would guess that Robin and Barney get married. I wouldn't like this outcome, Quinn was really nice for Barney.
A cliffhanger is ok for one season, but not when you used it to end two seasons. That just sucks. -_-