The 1.4 release of SyncEvolution replaces 1.3.2 as the stable, supported release.
1.4 is the first stable version with the in-vehicle infotainment (IVI) PIM Manager included. GENIVI Diagnostic Log and Trace (DLT) is also supported. For more information about this aspect of SyncEvolution, see the PBAP and PIM entries in the 1.3.99 release notes and these Automotive Linux Summit slides.
The biggest change for normal Linux users is Google CalDAV/CardDAV
authentication with OAuth2. These are the open protocol that Google
currently supports and thus the recommended way of syncing with
Google, replacing ActiveSync and SyncML (both no longer available to
all Google customers).