So, the main thing that I sort of understood from German-to-English translation of the interview is that Blizzard is waiting for some sort of a CONTENT GAP, when they’ll feel like they need to press the cheap and cheerful button that would enable “Timewalker content”, and therefore reward the players.
I could be wrong here, but it sounds to me like they HAVE the feature technically ready behind the scenes (perhaps without detailed rewards, but that would take them 1 week to finalize, not longer than that…) but are waiting till we run out of things to do, basically.
Then they’d invest A BIT of time into finalizing rewards (whatever those might be – drops, transmog items, some tokens/valor points, etc), and enable that feature as a content gap-filler, quite cheaply for themselves.
It’s certainly not the “we just don’t know how to reward you at this point” case. Nope. They are way too smart and calculated for that.