Michael Ausiello (EW.com) reports,
Question: Any new Smallville scoop? —Adelle
Ausiello: Present-day Clark comes face-to-face with future Clark (a.k.a. Superman) in next Friday’s 200th episode. But I’m pretty sure that’s old news. Here’s some new news. In the Oct. 22 episode, Clark finally decides to tell Lois his secret. Which is kind of funny because that’s the same episode she decides to tell him her secret: that she already knows! Hilarious, right? I thought it was.
Hopefully this means we finally get to see him in the costume even if it's a future sequence. Also Clark tells Lois before he's even Superman? Before Perry White and the Daily Planet or Jimmy Olsen? Honestly "Smallville" is really taking a lot of artistic license which may even disrespect the backbone of the Superman world.