This is fresh off the presses and it looks like there isn't even a formal CWA press release yet, at least on their public channels. Nonetheless, this has been confirmed by the new union, OneBGS.
Statement as follows:
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.






