Oh, you are right. They predicted a "small release" or "white dwarf supplement" with Carrion Empire later in the year on 1/29. The Battletome/spells/terrain for Skaven were announced on 2/3. That prediction did not hold up well.
If your source is correct, then it may be possible that the purported wishlister might have not been wishlisting at all. End of March/Early April was their prediction with a terrain piece and 3 spells (one was an ethereal/summoned dino of sorts).
As a Sigmar(Seraphon)/Blood Bowl player, it has been a bit agonizing checking the updates every day and not seeing much of anything. The two new battletomes were cool, but it has been awhile and even a slow reveal would be better than mostly silence.
Their strategy may be working, however, as chaos-focused warcry becomes more palatable.