Samba update is tentatively scheduled for an 8.2 release we'll do over the summer after Linux 4.12 ships. There are some issues with SMB browsing via Kodi with newer version(s) of Samba that we are still trying to understand.
The version of Samba we use is not vulnerable to the SMB exploit as compile options we set disable the vulnerable code path.
NB: DisplayPort has been supported for a long time and works - on latest generation NUC device it's the only way of getting HD audio to work. If it does not work for you it's down to a combination of your hardware, BIOS firmware, bad connectors or PEBKAC.