Imagine Larian were to say :"We're exploring ways to implement a day/night cycle". Then, imagine that none of the solutions they found really worked, or they conflicted with other systems, or were too expensive compared their benefits. How does Larian announce they cut the feature without creating animosity?
Quite simple actually, they say: 'we might consider a day night cycle, but we need to make sure it is within our possibilities to implement it. So for the moment consider it as if final release will not include a D/N cycle until we have gathered all the information and reached a final decision ourselves but at the moment is seems rather unlikely and depends on a lot of ifs'.
I'm not arguing that they should make fancy trailers and flashy gif animated promo material teasing possible features, i'm just asking for plain and simple communication, which to be fair - also includes 'we do not wish to address this issue yet as we do not want to raise expectations or disappoint either side of the debate as we need more time/data/planning to reach a decision on this subject'. They've done this with other things, so I don't see this issue. Multi-classing or the other PhB classes, for instance. We know they will come, but we don't know when and how. And that's perfectly fine. Now imagine they didn't say anything about multiclassing or their focus on PhB classes at all and how much speculation and potential disappointment that could generate ?