CardDAV support would be fantastic for anyone using Apple's iCloud sync as that uses CardDAV, CalDAV and IMAP. I'm using two apps on my Nexus 7 to add CalDAV and CardDAV support so with Google moving to that instead of MfE, it can only be a good thing that these open protocols are getting support.

I did raise a bug report over a year ago asking for CardDAV support but that went nowhere. I hope someone at Jolla realises the importance of these protocols.