May be old, but GoNintendo said again that GameStop preorders will open in-store on the 13th... but more interesting information is that online GameStop preorders will go up shortly after the presentation. Pretty obvious but still good to hear.
Apparently GameStop will hear the price and launch date perhaps a day before the presentation. Probably will leak if I had to guess.
http://gonintendo.com/stories/271329-gonintendo-today-s-big-story-1-4-17-exclusive-on-gamestop-on
Side note: I really respect GoNintendo, but I hate when sites lock information behind videos... I still wish Kevin luck and hopefully this strategy, while not my favorite, does well and continues to allow him and his team to produce great content.