Will they have a legendary and heroic Edition for the game? If so what will it have in it.
That info is unknown at this time, but it’s probably a good bet that they’re cookin’ something up. 
Nobody knows what the names will be but as with big titles, there will be collector editions.
Maybe in the near future.
I’m pretty sure there will be,
Although nothing has yet been confirmed.
PeacE
ShadEO9