Yes, that feature is on the product roadmap.
You can see the current community voted features in priority order on our User Voice site - you’re welcome to add new feature requests and vote on existing ones to influence what we work on as we develop Adobe XD.
Yes. It is planned.
You can view your prototype on mobile.
Open the link that you created for your xd project on your iPhone Launch the Safari browser and navigate to the link given to you by XD to add to your home screen. Tap the Share button on the browser's toolbar — that's the rectangle with an arrow pointing upward.
To install, the mobile version on your iPhone tap the "Add to Home Screen" icon and now it works as a app proto.