Yeah, I definitely don't want to see Lex Luthor ever again. He is way over used within the Superman franchise.
However, my excite-o-meter is not all that hot for this, though.
1. Superman (Although he is the father of superheroes, is about as generic or cliche of a hero as they come). Unless they do a Doomsday Movie, I am really not all that interested or excited about this.
2. Nolan (Although he is a very talented director, I wasn't wild about the Dark Knight as some folks were) (and I also thought Batman Begins could have had a bit more action sequences in it (while he was Batman).