See the announcement of Basecmap 3.3.0.2 here: https://forums.garmin.com/showthread.php?t=24413
It's still beta - and I wouldn't expect the final version to appear before end of January - but loads of changes.

Especially the routing avoidances have been revamped and are now completly different. Avoidances like bicycle, motorcar and so on are now officially a thing of the past and don't show up in the menu anymore. Therefore much more road classes can be avoided. Which means we have to find out which avoidance affects which road type [0x??] and if roadclass / roadspeed play any role.

So we now have (for everyone who cannot see the screenshot)
Road Type Avoidances: Interstates ; Major Highways; State Highway; Residential Roads; Unpaved Roads

Feature Type Avoidances: Toll Roads; Ferries; U-Turns; Cable Cars; Narrow Trails; Carpool Lanes; Date and Time Closures; Climbing Paths; Roundabouts; U-Turns




Also note that there will be different map layout modes based on profiles for newer maps -- reading the announcements I think Garmin will introduce a more or less completly new map format in future --- and I wouldn't be surprised if by summer we will see official Garmin Maps in Europe fully based on Openstreetmap - cause they need our attribution for achieving their goals..