I have a very bad feeling about this. [legal]
I admit, this doesn't bode well... but I'm not yet sold that it's an IP fight. Only as HG has had over a year already to pitch a hissy-fit over the Wasp (1SW was released on May 2, 2016), it seems a bit johnny-come-lately for them to only start flinging the C&Ds now (with as litigious as that company is and as public as CGL's Classics announcement was, I can't imagine someone there NOT taking a long and critical look at the designs from the get-go).
OTOH, I can't think of any other good explanations to why IWM started selling the minis then pulled them relatively quickly. If it were a pending announcement from CGL about new PlasTech Classics, I don't see them pulling the rug out from under IWM by telling IWM to basically eat the investment in the making of the expensive molds then not letting them use them. That's a jerk move that CGL just is not capable of from what I've seen of them.
Also, this is probably not "Things Don't Always Work Out" territory. Speck, if you are able and allowed to confirm, the embargo (or whatever) only extends (publicly, at least, as they're the only two other announced minis at the time) to the Wasp and Valkyrie, right? Can we take it as understood that it doesn't extend to the already-released-and-still-on-the-site Shadow Hawk and OstScout?