My understanding (from a news item last year or year before) is that the contract was up to and including 2007, so that means one more series (yawn).
Mrs R likes it but I felt there were far too many gimmicks this year. I'd like a return to Big Brother "classic", i.e. 10 weeks max, 12 housemates (at start), one goes each week, no replacements unless someone 'walks' (and no replacements at all after the fifth week, better tasks (and more tasks shown on TV - we saw hardly anything this year).
I've deserted BB since I started watching The Apprentice - much more watchable!!