This is what Devoted To Smallville had to say:
"Thanks to Anne Cofell Saunders, we now know which episode is being penned by her after a few teases on twitter. Ms. Coufell is in charge of writing the episode “Supergirl” that marks the return of Laura Vandervoort to the role of Kara and it’ll be episode 10.03 of the final season. Mairzee Almas directs this one."
Promorus - Does this mean she gets the name Supergirl in the series and does it mean Clark Kent will get the Superman name in episode one? If he does indeed get the name Superman, does it mean we will see the full costume in the first episode? I mean Lois has already seen the "S" on his chest and he always leaves a calling card with the "S" Symbol.