Rumors of two different Switch redesigns have been flying around for weeks now, and Nintendo has finally offered some kind of comment on the matter. Nintendo president Shuntaro Furukawa has stated that Nintendo has nothing to announce on possible new hardware, but Nintendo is always developing/researching new hardware internally. On top of that, Mr. Furukawa said that there are no plans to announce new hardware at E3 2019.
Does that mean there's no Switch designs in the works? Knowing how Nintendo operates, I would say they're just playing word games. Nintendo could very well announced new hardware in a Direct prior to E3, or just a few weeks after. As usual, Nintendo loves to play by their own rules.