Google Mobile put out on twitter about three hours ago that Google Maps for BlackBerry has been updated to v. 4.5.1. I checked their blog and do not see any mention of the update or change log. Google did make one statement that I saw on twitter that said get the update
"To see hours and filter searches by distance/ratings."
I am not sure what that means exactly but if you notice something new, be sure and leave a comment of your findings.