I seriously doubt wer're going to get tessellation and from what I understand the pipeline to create assets is a serious pain.
I'd actually be very, very surprised if we don't get it. It's not a feature I'd expect to be left out of
any modern engine, and I'd even be surprised if they left it out of the game itself.
5) Different body types (young, old, slim, muscular, etc.)
This isn't really an engine feature, just a matter of Bethesda putting the effort in to include it in the game itself. The same applies to the things you've asked for modding - the engine could support those before, Bethesda just doesn't implement them as options in the CS.