Steve Younis's Superman Homepage relays news from Ask Ausiello that Tom Welling is close to signing on for a ninth season of Smallville. I've been calling for Smallville to wrap for years. At the same time, I have kept up more or less. That may change when Bones moves to Thursdays starting next week.
I think Clark could become Superman on Smallville. Smallville is more than the name of a town; it's also Lois's nickname for Clark, even as he regularly dons the cape and tights.
Then again, Catherine Bell signed on for an eleventh season of JAG that never materialized, so we'll see.