Source & More: hollywoodreporter.comThe series, created by Carter Bays and Craig Thomas for 20th TV, centers on Ted Mosby in 2030 (voiced by Bob Saget) telling his children how he met their mother. With the two-year renewal, it is more and more likely that audiences won't be finding out the identity of the mother any time soon -- at least not until 2013.
One theory I see offered elsewhere is that we get a big clue---if not a total reveal in the wedding episode that ends this season. I am in the minority here but I have always felt that this show is not really about the gimmick it started out with and that it could survive revealing who she is and become more about how they get together etc. In fact this has evolved into an ensemble show and it is questionable that Ted is even the most important character at this point.