Who knows perhaps we'll see a repeat of Senna/Prost but between Vettel and Webber. In terms of the Championship Webber has nothing to lose, Vettel on the other hand needs to finish in the points. He can still theortically lose the Championship. An engine blow up, a KERS issue etc.. Better to play it safe and aim to finish ahead of your title rivals instead, it doesn't really what position you finish so long as it's ahead.
It would be nice to see Webber win a race again before he leaves F1.