Looks like Supergirl will be making her Smallville debut when the show comes back in this fall.
Supergirl comes to Smallville
I'm personally excited for this. For too long Smallville has been more Dawson's Creek then Superman. I'm hoping that for S7 the writers get their heads outta their asses and give us more adventurous storylines and the proverbial "I love you Lana, but we can't be together because I have a secret and I don't want to tell you." story line again.
Adding Bizzaro and now Kara Zor-El I think will definately help make this year more watchable then last season