Xbox One 二代 translates to “Xbox One II” which could very well be a production codename.
Interestingly the image states that the item mentioned in the plans has been in development from February 2014 but went into mass production in February 2016. The weight of the item is also interesting since 600 to 800 grams is a significant weight reduction from the existing Xbox One console.
It’ll be really interesting to see what Microsoft has planned. Expect to hear more at Microsoft’s E3 conference in June.