Mortgage rates were more intuitive today with most lenders keeping things unchanged at first. This matched the movement in underlying bond markets, where today's trading levels in the morning (when most lenders put out the first rate sheet) were roughly in line with yesterday's.
As the day progressed, however, bonds began to improve steadily. This improvement was enough for many lenders to issue positive reprices in the afternoon (i.e. new, lower rates for the day). While every little bit helps, we're only talking about a token change in most cases. The average borrower will see the improvement in the form of slightly lower upfront costs, with no change in the actual note rate.
The average lender continues quoting conventional 30yr fixed rates at 4.0% for top tier scenarios. This hasn't changed fore more than 2 months.