Standard rotation will come in with the set codenamed "Archery" (expected September 2019), and there will be a new format (like "Arena Modern/Wild") to allow playing with your rotated cards.
They would like to put Arena on all other platforms wherever people would like to play Magic, but it may be a while yet.
They have no intentions of allowing people to disable animations.
Popular one-off events (e.g. Singleton) are not expected to become permanent to avoid the player base from being stretched across multiple queues.
Friendlists will come hopefully soon.
They would like to implement multiplayer but it will require a huge overhaul so might be a distant project.
They would like to implement non-AI drafts but it would be difficult from the back-end, and even if it's possible, human draft queues may not fire as frequently as people would like. May be more likely once friendlists get released.
No plans for in-game chat against strangers, chat between friends are coming.