

It's totally official, Detune Ltd. already has a page up! http://www.detune.co.jp/Korg_Gadget_fir ... hhtml.html
Looks like it's slated for release in Spring 2018.
Price is TBA. It's a safe bet to assume it'll support downloadable content. The Switch is more like an iPad than a Mac so the price will probably be around $40 for the software and then $10-$15 bucks for various Gadgets.
This will be the first full fledged DAW for a home gaming console. Unless you want to count stuff like Mario Paint back in '92.
Also in other news, Katsunori Ujiie was showing off this upcoming portable workstation by a company called Cyberstep.

Here's the website for that: http://www.kdj-one.com/home#first