[UPDATE: Apparently producer Al Gough has changed his mind and wants Smallville to go 8 seasons.]
Over at JewReview.net there's an interview with Michael Rosenbaum who plays Lex Luthor on CW's Smallville and he confirms that next season (which is Season 7) will be the last one for the series.
"Yeah, we’re finishing up our sixth year and next year is the last year."
Sounds like confirmation to me. Of course I reported that Smallville would only go seven seasons a year and a half ago. :-)
The show's ratings are strong and it's as popular as ever. I think it's great that they'll be going into next season KNOWING it's the last one. That way they can map out a season-long arc that will hopefully flow really well and give a fantastic close to the series. It should be the culmination of the the Clark/Lex relationship, finally bringing Lex completely to the dark side:
"...next year is going to be the biggest year of all; it’s the final year and everyone’s going to see what Lex Luther is really capable of. All hell’s going to break loose!"
I know that there are a lot of fans who would like the series to go on and on, but I hope the producers stick to their guns and end the show while it's on top. There's nothing worse than watching a great show stick around a season or two too long.