Yesterday, we reported on a rumor that The Legend of Zelda: Breath of the Wild won't be ready in time to be a Nintendo Switch launch title. This information came from a pair of tipsters: Emily Rogers and Liam Robertson. According to Rogers in particular, the game hasn't finished its localization process yet, and will still need an additional 4-6 months of bug testing after that's done.
Since then, another source has stepped forward to make the same claim. According to Eurogamer, sources close to Nintendo have confirmed that a 4-6 month bug testing window is indeed planned for Breath of The Wild, pushing its release until after Switch has launched. Laura Dale of Let's Play Video Games (who has proven reliable regarding Nintendo Switch details in the past) has also heard that the game could miss the Switch launch from a single source.
Nintendo never committed to launching the game alongside the console, but many fans had hoped. According to Eurogamer (as well as Rogers and Robertson), Nintendo's new Mario game is likely to be the system's big launch title in place of Zelda. Eurogamer reached out to Nintendo for comment on the story, but Nintendo declined.