OK, stop what you’re doing. There’s a new Michael Keaton movie on the horizon….and to those of you skimming the title and body of this post too fast, no, he’s not taking up a new cape and kicking crime’s ass (we wish). But he is however starring in the latest from Alejandro Innaritu. In a premise so crazy it might just work fantastically (again, we hope) Michael Keaton is, in fact playing a has-been actor who played a superhero earlier in his career and now seeks so reclaim his former glory in this dark and slightly trippy looking comedy. [Disclaimer: this is in no way autobiographical] This week we’ve seen…