In the user guide on page 665, Microsoft states they are considering these features. I can't find them anywhere on the roadmap or in these new idea suggestions. This suggestion is primarily for #1 which would create a marketing-only contact when a lead is created and associate it with the lead until qualification. #3 is essentially the same thing in bulk.

1. An initial contact-creation workflow that is inactive by default, but which you can activate and customize as
needed to support your in-house processes.
2. Contact list views that are pre configured to show or hide marketing-only contacts for various audiences as
needed (for example, a marketing view that shows all contacts, and a sales view that hides marketing-only
contacts).
3. A built-in feature that creates and associates contacts when you import large numbers of leads at once.