It'd make sense for them to do it since WB is their sole licensor that we know of right now. But to be honest, I don't think there's much motion in the world of HP merch any more.
HT has no competition with QS/IA. They MIGHT, eventualy have competition, but until I see real, mass produced figure that has been handled, reviewed, and put through the paces, there's nothing but an impressive looking Joker prototype. The first rule of this hobby is that the prototype should not be the gauge of the production. The best work can flounder on at that step of producing a figure; if the rumor is true that IA is using the same factory as DAMToys, their figures will be really, really good but won't get close to HT.
With the right production management they may be able to squeeze it up to HT level, but I just don't see that tier of manufacturing suddenly be able to blow past 20+ years of experience in the biz out of the water.
I want to be wrong, I want to see some insane leap in product quality here that brings 1/6 to the next level, but prototypes are essentially empty promises, even from HT. I can't expect more from IA until they deliver. And I have money on the line here saying this, I've POd Joker, I'm not just making these statements from the sidelines.