Is there a beta for this or is there any upcoming? The
OpenVPN AS beta page doesn't mention one.
We're looking into replacing OpenVPN AS in the next 12 months exactly for this reason, lack of SAML support. Unfortunately applications don't always implement this in a user friendly way so it will be interested to see how OpenVPN solves this.
If there's any upcoming beta programme for SAML support I'm more than willing to participate and give feedback.