There have been a lot of rumors flying around that Breath of the Wild will miss the Nintendo Switch launch and potentially arrive during the summer. That time table now conveniently lines up with GameStop’s present plans to promote the title during Q1 of next year. Q1 would mean the title is not releasing in march and could possibly release in June or early July. Given that we know the CEO of GameStop got to play on the Switch a few weeks ago, chances are other conversations were held, including when they should expect to begin marketing Breath of the Wild.
Obviously none of this comes directly from Nintendo, so for now we still truly have no idea when Breath of the Wild will release.