When do 3* Dr. Strange covers go into Heroics, Elites, and Standard tokens? I would like to open a bunch to try to get Strange, but they don’t seem to be in anything except Strange Sights tokens yet.
Probably at the start of the next PVP Season.
In the meantime you have chance to pull him from Deadpool V MPQ PVE! 
I’m wondering when the 5* goes Legendary.
I’m not sure if I remember well, but I think previously 5*'s went to the Latest LT’s just after the release event.
So maybe he will go to Latest already tomorrow…
BTW: Who will now drop to the Classic LT? Hulk or Black Bolt? I don’t remember who was released first.
Hulk will drop. And let’s see how they play it. As he further dillutes the classics.
I guess we should have an announcement regarding 5 Strange today, I think he might appear in Latest tomorrow, just when Strange LT store expires maybe.
Regarding 3 Strange, probably by the end of this season, when 4s are added.