First of all, your down payment will determine the amount of the loan you'll need, and this will affect the size and duration of your mortgage payments. (homeownership.ca)
If you do not intend to stay in your home for duration of your mortgage, you want to consider when you will «break even» on your upfront closing costs from your monthly payment savings (if refinancing lowers your payment). (ifsautoloans.com)
The technical factors - referring to hedging against the increased expected duration of mortgage assets as mortgage rates rise - appears to me to be related to a general increase in rate pressures as a whole, but I will defer to fixed income specialists on that topic. (economistsview.typepad.com)