I would compare the improved rate to a CD with a 36-48 month term which appears to be ~3%. Based on that I would start moving now.
In 3 months, I expect rates will be higher, but not enough to wait. In 9 months anything could happen. I would start now and take advantage of the improved rate over the next 3 months if you want to hedge, or just get it done now.
with no reasonable expectation for ER, I'm just here auditing the AP class.Retired 8/1/15.