Dark mode has been pulled from the release. During the testing period, I realized it's going to be far too difficult to support in its current state. Sorry to those who were looking forward to it, a rush of bad judgment and excitement I suppose led to that announcement.
I'm off to the announcement for the updates.
A popular feature that has been requested for some time is some sort of off-canvas sidebar where the sidebar collapses off-screen while viewing via mobile devices. This is now implemented (via an option).