Daniel Vettori
No, Vettori is not an Aussie - he's a Kiwi (from New Zealand). I'm not finding any information on him coming to the Devils - where did you read this? It doesn't make sense to me given that he's doing so well for New Zealand.
Daniel Vettori really seems to have a good thing going right now and, like batgirl, I don't see any reason for him to make any changes at this time. However, in the world of sports you never know what might happen. There are a lot of behind the scenes things going on that the fans never see.
I haven't seen anything about Vettori making a switch. Perhaps the original poster could put a link here to where he originally found that information? I think perhaps you misunderstood something though as there would be something to show up in a Google search about it and I can't find anything to support this.
I am still not sure about the Oz/Kiwi mixup but I have found out some things about him since doing a little more digging: - scored 3,000 Test runs - had a crazy back injury (I am surprised he can still play) - theres an biography of him out that I must have missed, most times I catch these things.
I do not have one, oopsies?