Just noticed that there is a new site for hut reservations in the Alps. The new site was created by a cooperation of DAV, SAC, OEAV and AVS.
https://www.hut-reservation.org
Not sure if indeed reservations are possible for all huts, but did check some random huts and they were all in there. The site looks nice. It is also possible to merge multiple accounts from the old alpsonline into one (logon as to the one you would like to keep and than start the merge process). It works.