Well for right now some things:

Unpaved roads are not properly avoided any more over longer distances.
Motorcycle behaves like the old automotive routing in Mapsource 6.16.3; Automotive is still pretty similar. In reality there are the following different routing algorythms:
a) automotive/trucking
b) bicycle/tour bicycle/mtb
c) motorcycling
d) atv/dirtbike
e) walking/hiking/mountaineering

Of course none are interested in the old way of how things behaved with avoidances.
For bicycle at least I couldn't identify any avoidance to work as expected (also things like residential streets 0x07 are not avoided at all). Over long distances there is however a subtle difference based on avoidances - but I cannot identify at all on what it is based...

On 15.12.2011 14:09, Felix Hartmann wrote:

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..