The BlackBerry edition of Google Maps has been officially updated to v4.0.1 today. One of the added features packaged with this new is a "Buzz" layer. As with Traffic, this additional layer can be toggled on or off at the users discretion from the map screen options. Personally, I have found very little use for Buzz, but the dramatic increase in version from 3.2.1 to 4.0.1 hopefully indicates that additional fixes and features are here or on the way.
New in 4.0.1 is Search By Voice, Starred Items Sync, Search Suggestions (based on your search history).