Bottom line? Everyone wants a piece of that sweet, sweet Classics money, and right now everyone with a stake seems to be playing nice and trying to share.
I have no inside info, but it seems pretty obvious that Catalyst wants a chance to release some of the more popular minis in plastic before IWM releases them in metal. We don't know exactly what that list includes, but given the prototypes they've brought out in the past year, the locust, warhammer, marauder, battlemaster, and griffin, those seem likely to be on the list of minis CGL is looking at making. No guarantees, but they had a limited number modeled, printed, and painted to show off, so it seems logical they might want to sell some eventually.