Thus far stable and patiently awaiting 4/1

.... I did see something software related, although not directly related to 3.4 or the new features. - For an awareness..
Tried connecting to VPN, "Add a VPN Connection" is grayed and not selectable. Command line seems to work in lieu of.
I reloaded beta, prior to running updates "Add a VPN Connection" was selectable, after updates completed again grayed out.
For those using anyconnect/openconnect: In terminal enter the below adding your server in place of SERVER.
sudo openconnect SERVER
Perhaps a future update will correct but should 3.4 go live this should suffice as a work around..