Was going to post a link about the HoTM family bonus, but looks like you might have already found it, but the HoTM bonus is actually live now, and was part of the V.42 update (that contained featured the Clash of Knights updates).
The HoTM family bonus was also not active until just few days ago and probably saw some of its first action during the mid-week war.
I am not in the beta program, some beta testers who frequent the forum could probably tell you some identifier of the beta testing environment.