Even though he’s on hiatus while switching from TV Guide to EW, Ausiello is still dishing out the scoops:

My increasingly itchy moles report that Sam Witwer, best known to Battlestar Galactica fans as ex-Raptor ECO Alex “Crashdown” Quartararo, has been tapped to play the series regular role of Doomsday. Additionally, relative newcomer Cassidy Freeman is joining the cast as Tess, a sexy and vengeful firecracker with whom Lex hires to run his empire in his absence. Ironically, the actress’ most recent credit was the failed CW pilot Austin Golden Hour — starring none other than Green Arrow himself, Justin Hartley (who’s back on Smallville full time next season).