Not that fond of Watson opening really, still think that Symonds should make way for him and one of Jaques or Rogers come into the opening position. If the selectors can drop Brad Hodge after making a double century and still averaging 58, they shouldn't have any problems with dropping Symonds, averaging just over 27 after 13 tests and being largely ineffective with the ball. That said, given the amount of praise heaped on Symonds by the media and fans, I fear that this won't be the case, and that Watson's only chance would be as opener. I just don't think it'd be good for Watson himself, given the increased workload, and the fact that he's not all that experienced at doing it, while it also won't be good for Australia in general, as we'll be playing with two unproven allrounders and only one opener.
I've not seen any of Rogers, and seen very little of Jaques, but going from what I've read on other sites and in this thread, it seems that Rogers would be the best at complementing Hayden in the top of the order, given that Jaques seems to be more attacking and more likely to take risks. But then again, Hayden's not going to be on the scene for that much longer really, so this probably won't be all that much of a deciding factor, and Jaques may get the nod given that he's already played two tests.