There's a lot of conjecture about whether interest rates will rise in 2017, after the record lows we have enjoyed this year. Unf
Remember, the advice from financial planners is that fixing a mortgage shouldn't be about bargain-hunting, but managing your cashflow and providing certainty.
Here's a great article from The Age "Why so few of us fix interest rates at the right time". It's your decision - remember you can choose to fix just part of your mortgage, and its not a lifetime commitment... just for the period you choose to fix for (typically 2,3 or 5 years).