Possibly. But I was more getting at that as far as I can tell, there's been zero hint of that up to now, aside from these cards having been in the data for a while. Hard to tell if they actually know something, or it's just blind speculation because we just got an Insect-themed pack.
A card being added to the game files doesn't indicate its intended use, if it even has one. And cards can, and often do, sit around unused for a long time before we get them. We got Dark Hunter not long ago, and it was there for months.