Though consistency is an issue, Australia bring with them the largest contingent of effective strike bowlers. Probably the biggest debate is whether they focus on this too much.
Pakistan would be next. The three main bowlers are between themselves quite skilful and quick. One would also think they are the ones who will be most at home in the conditions. Their weakness may be the ageing Shoaib Akhtar, who hasn't exactly been at the top of his game in his most recent stint. Fielding can also be an issue that impacts on their bowlers, but they seem to have figured this out for themselves. Their depth isn't overwhelming with the loss of Amir and Asif, but it isn't so bad either.
I think South Africa raise more questions than the above two. Dale Steyn's abilities as a Test bowler raise his profile immensely, but little of his ODI work has added to that. Their depth is also questionable. If one of the top bowlers is out, are they anywhere near as effective? Without Morne Morkel, their pace might not even be as good as England.
England are comfortably fourth placed, but as above, close enough to make ground. Stuart Broad has been effective, but comes back from a lengthy injury. James Anderson used to be seen as an ODI specialist, but it seems a wiser, more accurate Anderson is decidedly less dangerous. Ajmal Shahzad is probably the key; he is an interesting young bowler with much ability and skills that could come to the fore in the subcontinent. If Shahzad comes to the fore, England will have a tough attack to face.