Hmm, would that Chaos lord be Lascillion? He, if I remember right, basically uses his tongue to taste not scents but emotions. Nice but that is not really exploration of olfactory sense. Check out the movie Perfume from 2006 for a better insight into this particular sense. Honestly, GW could easily create concept on use of perfume/fragrance and censers. The Lurid Haze are precisely that. Let us hope we get some models in the future and that they will be in our new battletome.
I am getting concerned too, this absence of any proper news on Hedonites is weird. That Metawatch article was, at this point, truly meaningless. But we got that Hateful Stasis short story. But no announcement of any proper books devoted to Hedonites and Lumineth are getting them like hot cakes.