Well with Hawkgirl being part of the show, its not a terrible shock that we'll be getting Hawkman as well, but its nice to get confirmation.
During DC Entertainment's Super Hero Saturday Night panel (which is causing me to never being able to leave my laptop in an effort to keep the site updated. I'm serious, not even potty breaks. I'm a slave driver!) Geoff Johns let it be known that Hawkman will be part of the show.
No word on if Michael Shanks and his chest plate will be making any cameo appearances.