Ok, I did a little more digging... Toy Biz Worldwide is a separate firm created in 2001 after yet another restructuring at Marvel. Back in the '90s after Marvel bought Toy Biz, and later shenanigans ensued in order to restructure the corporation and Toy Biz Worldwide was formed and bought Marvel, this was then reversed a few years ago, and when they split off the factory that was manufacturing for Toy Biz licensed the name to create a separate Toy Biz Worldwide (we'll call them TBW for short). Toy Biz became only a distribution partner for TBW who was the designer and manufacturer of the partnership, and now that Marvel has severed ties with TBW, they're losing all OEM manufacturing which I believe includes moldmaking and may or may not include sculpting and part of the design work.
Does that answer your questions? No? Well, that's because nobody outside Hasbro & Marvel actually know and aren't saying. My best guess is Hasbro won't want someone else doing the bulk of the designing and sculpting though.