From That Season 10 Promo Video: Was That _______?

In the Smallville promo reel from Season 10 shown at Comic-Con, Kara and Jonathan weren't the only returning faces that we saw... there was someone else. Who was it? While more transcribing interviews are going on, here's a quick snippet from Executive Producer Kelly Souders...

I personally think it was lex, but i also saw emile(the doctor) and Hawkman!