Just so we’re all on the same page regarding the important information, there are currently no plans for Netflix’s excellent She-Ra and the Princesses of Power to somehow incorporate He-Man’s prince Adam into its story. But that’s not to say that He-Man’s not about to come back in a big way.
Source: io9 – Little Known She-Ra Spinoff He-Man and the Masters of the Universe Is Being Rebooted by Netflix