From all of what I have seen of Katman as an opener, I think he is at his most tentative, when the ball is new, and doing something, either off the pitch, or in the air, a lot of bowlers see Katich shuffling around in front of the stumps, and think of him as a prime lbw candidate, but that's not really the case.
He has real problems when people bowl, just ouside the off-stump or thereabout, and if the English bowlers get the new ball to move, while maintaing that line, then Katich could be in lot trouble, but if Katman sees off the new ball, then he very rarely throws away the start he gets, so Katich' success on this tour really depends on how he counters the moving ball, because last time around, he was all over the place against the reverse swinging ball.