With 2year fixed rates close to 1% and 5year fixed rates well under 2%, it's difficult to see how rates could possibly get any lower - ever !
The mortgage market has slowed a little in the last couple of months, so lenders have been searching for more business, and one of the main ways to do this is to drop their rates, which is great home owners/buyers.
My thoughts are that it would be advisable to take advantage of these rates now... they can't last forever !