no official CWA press release yet, but here's the union's:
Workers at Bethesda Game Studios have joined the Communication Workers of America, forming the first wall-to-wall union at a Microsoft video game studio. The workers, consisting of 241 developers including artists, engineers, programmers and designers have either signed a union authorization card or indicated that they wanted union representation via an online portal. Microsoft has recognized the union.
Unionizing wouldn't normally really give workers more control over the product, it's about worker benefits, and management levels who direct product are usually excluded from participating in a union.
(Not that writing better code will help if ES6 is still running on Morrowind's relabeled gamebryo engine like everything they've released since Morrowind, of course, but one can hope...)