There is concerted effort on the AOM list to finish and close all bugs or features that require normative bitstream changes, so I would expect it isn't too much

There is concerted effort on the AOM list to finish and close all bugs or features that require normative bitstream changes, so I would expect it isn't too much longer. The number of remaining issues is small-ish, but not zero. The involvement of hardware people has been a boon, though tough for software people at times :).