I’ll give a quick update. Dark mode for Android is most of the way there. In fact we’ve been staff testing it for months (and looks quite slick 
).
iOS is a bit behind though, and it is very unlikely to happen in the next 3 months (to give some minimum expectations), also because the mobile team is busy with other - potentially more impactful - changes.
We won’t release it for one platform before the other (sorry if you want that), so that there is a bigger announcement with both