I just watched it, as far as I can tell, it’s the Donner cut with some extra scenes dropped in and a partly (?) new-ish sound mix. I noticed:

-A short extension of the Lex/Jor-el fortress scene with some stuff I’ve never seen.
-the full East Houston “you only smell strong etc.” from the theatrical Lester version, (but when Zod levitates the guy with the rifle, the beam effect isn’t there.)
-the kid on the horse getting killed by Non from the TV version (the kid has a different voice, no longer has that accent)
-the cooking-souffle’-with-heat vision scene from the TV version

Weird!