Unfortunately, this seems to be an ongoing issue with ADS that goes back many years, even long before SAP acquired Sybase. I / We have learned that it's pretty much hopeless to expect an "official" release of an updated ADS until it's nearly time for another Delphi release. I've had to completely skip a Delphi release or two for that very reason.
With every other vendor's library that I use, and I use several of the best, it seems that they have support for the latest Delphi release within days, maybe a week, of Embarcadero announcing the new Delphi. With the resources that SAP must now have available for acquired Sybase/iAnywhere products, I just really don't get the immensely long delays.
It's extremely frustrating. I can only guess that SAP knows it would be a gargantuan effort to rebuild thousands of applications around a different DBMS, so they'll get around to it when they get around to it. Somehow I feel that the big SAP products like HANA, etc. don't suffer this problem. Makes you wonder why they acquired Sybase in the first place.