BaseCamp v4 Beta's are available
The v4 Beta's of BaseCamp are available and it appears that the BaseCamp teams are listening:
Mac-BaseCamp 4.0 is here.
The Win-BaseCamp 4.0 is here.
Garmin believes these beta to be reasonably stable, but it is a Beta, so there are definitely some quirks to be expected.
A few words about your data
When you install 18.104.22.168, all your data from 3.3 (or earlier) will be copied. You can keep using 3.3 afterwards, 4.0 will not alter your 3.3 data (but 3.3 also cannot see any changes you make with 4.0).
This is the list of changes. There is a separate thread What’s new in BaseCamp 4.0 that gives some more explanations (please excuse the Windows screenshots until I get a chance to create a Mac version. The features are basically identical between the two platforms), and a Garmin Adventures thread that introduces that new feature (again please excuse the Windows screenshots).
Added support for Garmin Adventures.
Added support to search for adventures.
Added support for transferring adventures to devices.
Added support for authoring and publishing adventures.
Added chase camera adventure playback.
Other New Features
Added intersection search. If you add an '&' between two roads, it will find the intersection, e.g. 'Main & Elm'
Added support for BaseStation mode for Rinos and Astros. Firmware support coming soon.
Added better trip planning capabilities to a route (you can set arrival/departure/layover times for via-points ).
Added a context menu for the hand and selection tools.
Added a read-only 'Unlisted Data' list that contains all items that are in no other lists.
Added support for waypoint creation date, which will not be changed when updating the waypoint.
Added information in waypoint properties which routes that waypoint is a part of.
Added ability to create a route from a named trail.
Added support for temperature and pressure in track statistics and graphs.
Added support to delete waypoints that are included in a route.
Added ability to perform undos and redos on supported devices.
Added ability to create waypoint from find result on the map.
Added a photo viewer for Geotagged Photos.
Improved display when many photos are at the same spot on the map.
Improved XML processing (so it should now be possible to import and export larger gpx files than previously).
Fixed numerous issues with finding addresses.
Fixed area calculation for tracks.
Fixed issue where the Geocache symbol was not consistent with found status when importing or adding a geocache.