Coming from a Nintendo Dream interview with directors Yusuke Amano and Tsubasa Sakaguchi as well as producer Hisashi Nogami...
On level cap being raised:
Sakaguchi: Er… That is also under investigation currently… We originally expected level 20 to require a nice amount of time to play.
Nogami: [The leveling up has been] so fast that it makes me worry about players’ daily life…
On character customization:
ND: “The more character customization, the better” is the usual rule in online games. But you can only customize the eye and skin color of your Inkling.
Sakaguchi: Perhaps everyone has forgotten that Inklings are still unknown characters for people. Inklings are newcomers that just came out.
ND: Ah, that’s right (laughs).
Sakaguchi: I think it’s better to tightly narrow down “it’s this” when presenting a new character to everyone.
Nogami: If we suddenly had variation like three hairstyles with braid or bun, people wouldn’t consider them as the same thing [character]. Therefore we limited the customization to the minimum with skin and eye color.
Nogami: Talking about future events, first there’s Splatfest. Please look forward to those.
Nogami said that he'd “like to have one Splatfest in every three weeks or so in the beginning. Also things like new weapons and maps are under investigation.”