Vincent_lacruz
Warlord
They already mentionned that happiness will mater both locally and empirewise.Inferring from what we have not seen, it's unlikely that Loyalty returns. I'd speculate a combination of Happiness (returning to replace Amenities) and Culture will trigger whatever "flipping" mechanics exist, if any.
As with so much, we're waiting until the marketing rollout gets around to this topic.
Global happiness will accumulate and trigger events/celebrations, which should prove a good thing.
However, having said that local happiness matters might means effects ranging from lower productivity to maybe flipping. Especially during crisis, where a lot of the crisis card seem to reduce hapiness (which is rather thematic^^), and would point in the direction of city flipping mechanism.