I'm with Hohns on this one. But if Lawson is right and there are 25 other bowlers more qualified than Johnson, I've wasted all my time fretting over who'll be replacing Mcgrath cos i think this guys screams potential and he should be ingratiated into the side asap.
From the limited footage i've seen ie. a few domestic games and the one against NZ, he looks to have the ability to bowl quick and with SWING, and late swing at that. His action is smooth and clean also with an economy of movement (but he can bend his back for that extra swing), which leads me to believe that he could become pretty accurate (unlike Tait).
Despite his poor figures in NZ (which should be discounted IMO cos he was on debut and the pitch was a belter), I think now was the correct time to pick him, as we've got a year to work with him before the WC, and 10 months b4 the Ashes.