A few things to watch with this system are:
Its rapid acceleration NE'wards when it gets close to Japan means a fast forward translation speed which in turn will add significantly to the wind speeds on its E & SE flank if
it landfalls. Conversely, wind speeds should be lower (in comparison) in areas on its northern side.
Possibility of storm surge for exposed low-lying coastal areas (see below).
Chance of a 2nd system forming off southern China, some possible Fujiwara interaction with Typhoon Guchol if it gets close enough behind it albeit maybe just a bit of a wobble, before sliding NE in a similar path to Guchol. But this 2nd system currently looks less intense & far more elongated/distorted than Guchol.Probability of typhoon formation in the 48hrs from 18z Sat generated by the GFS ensemble: Storm surge modeling from the European JRC: