Larian explicitly said there won't be one, and that's before the EA even started.
Many of us expressed malcontent or at very least disappointment with that. And I mean MANY. Across countless threads and several months of discussions:
https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=760211#Post760211Will Larian change its stance in an attempt to address the feedback? No one knows, since Larian never seems to be willing to talk in advance about changes they are working on.
But realistically speaking it seems very unlikely. I would make peace with the notion that the game won't have any day/night cycle.
Personally? I still think it's a fucking bummer and that the people who say "it's not a big deal" will start realizing what they are missing only after the release, when waking for hours through the streets of a Baldur's Gate permanently stuck in an eternal noon.