I'd watch that too. There's never been anything from the Empire's perspective except in some of the novels and comics. I thought Lost Stars did a good job of this (YA romance stuff aside). I'm actually much more interested in seeing more on the Empire's rise between Revenge of the Sith and Rogue One than I am for a Han Solo origin movie. They could build on Rogue One by having some of the older characters in that film make an appearance as younger selves, particularly Tarkin and Donnie Yen's character.