My theory is that the Stig will replace the Kaxe Z as a neutral-to-understable mid/fairway, probably similar speed to the Kaxe Z but more understable to distinguish it from the Kaxe.
The Krut and Guld will probably be a 1-2-punch replacement for the Grym and Grym X. I think they're among Kastaplast's less popular molds and the Guld has been a much bigger success so far. I'm guessing the Krut will be a tick slower than the Guld and probably more neutral-to-understable, kind of like the Grym or maybe between the Grym and Grym X, flippy Wraith-esque, maybe.