There is not much info about this in the guide yet. I have begun a rewrite of the ‘sequences’ section, which concerns the sound editor and also editing of audio events etc. on tracks.
Crossfade is not yet supported. I assume what you are looking for is a feature for crossfading overlapping audio events on tracks. This is on the plan.
multiple region edits, non-destructive recording
I’m not sure if you are referring to editing in the sound editor (destructive), or editing multiple tracks with audio events in an arrangement (non-destructive). Could you give a more detailed explanation of what you are looking for?
Frits