Mild spoilers ahead...
The last two episodes of How I Met Your Mother's eighth season may be titled "Something Old" (airing May 6 and featuring the return of Robin's dad, played by Ray Wise) and "Something New" (May 13), but don't assume that means we'll finally see the long-anticipated nuptials of Barney (Neil Patrick Harris) and Robin (Cobie Smulders). "I don't want to necessarily promise the wedding," executive producer Carter Bays says. "It's more complex than that."
"We're going to be taking some surprising risks with time. The finale is almost like a pilot for the new series that the ninth [and final] season becomes."
I don't think we're going to get a "How I Met Your Father" scenario or a full season where we get to know the mother. I think the entire cast will be front and center as usual and we won't see the mother until May of 2014 eventhough the wedding will take place in May 2013. So how will this work? Here's one possibility...
Season 9 will take place entirely on the day of the wedding. Think 24