2019-05-03 : Gaining control of a permanent doesn’t cause you to gain control of any Auras or Equipment attached to it.

2019-05-03 : If one of the target permanents is an illegal target when Role Reversal resolves, the exchange won’t happen.

2019-05-03 : If the same player controls both permanents when Role Reversal resolves, nothing happens.

2019-05-03 : Role Reversal’s effect lasts indefinitely. It doesn’t wear off during the cleanup step, and it doesn’t expire if the permanents stop sharing a permanent type after Role Reversal has resolved.

2019-05-03 : The permanent types are artifact, creature, enchantment, land, and planeswalker. Supertypes, like legendary, aren’t permanent types. For example, you can’t exchange control of a legendary creature with a legendary planeswalker.

2019-05-03 : You don’t have to control either target permanent.