Well, if I remember correctly, since the new Batman movie is coming out, the WB or whoever is in charge decided that there would be NO Bruce Wayne appearing in Smallville anytime soon.
It is my hope that they may change that after the Batman movie comes out.
As a bit of trivia, I believe that Smallville was actually suppossed to be about a young Bruce Wayne and his training as a teenager to become Batman. Instead, we have Smallville, which I love, but still would love to see a young Bruce Wayne training to become the Bat.