I don't remember seeing any upcoming projects Tom is doing when I looked his IMDb page up yesterday. But, I really wasn't looking. Or at least nothing connected.
Lack of time could be a factor as well.
I remember that "hissy fit" post. I don't remember who posted that.
But, I'm pretty sure Tom wants diversity. Playing Superman wouldn't be a different character (and I know I'm one who complains about Clark Kent needing to step up and become more like Superman.)