I was just curious as you phrased your post as if this was safe to assume this feature was coming. Was it announced anywhere? I can’t remember this ever being mentioned by Apple. Personally I doubt it’s high on Apple’s list of priorities.
I wish it were true, but knowing Apple I think there's a snowflake's chance in hell of that.
Apple wants us all individually tied into our own individual machines and accounts.
I would love to have an iPad that lies around in the living room and both my husband and I could log in to and check our own accounts and so on. But… nah… not happening.