Always a question at, or near, the top of every home buyer's mind. I really like this site for guidance: http://www.bankrate.com/news/rate-trends/mortgage.aspx
I used it myself for my loan lock decision on my home and I recommend it for my clients. It is near-term info, though, what's happening in the next week.
I think, for the longer term, a lot will depend on how Congress handles the "fiscal cliff". If they bungle it and erode consumer confidence, the rates may have to go down to compensate and calm the masses. If they handle it well (wouldn't that be a miracle??), I think we'll see steady rates for awhile. Whatever happens, these record-low rates are AMAZING, and I'm SHOCKED there aren't more people falling all over themselves to buy now!