I know this thread was posted before, but this time JAL posted photos and more detailed information.
JAL will introduce first class for the first time on domestic flights. The new offering will be rolled out on seven daily flights between Tokyo Haneda and Osaka Itami . From April 1, the first class product will be available on flights from HND to Fukuoka and Sapporo.
The seats will be arranged on board B777-200 aircraft in a 2-2-2 configuration, and a center partition made with a wood finish has been added between each pair of seats for extra passenger privacy. The customer-friendly principles of Universal Design have been incorporated into the seat's design to ensure that it is usable by as many people as possible regardless of age or physical condition.
Passengers who have purchased a domestic fare ticket can upgrade from economy class to first class by paying just 8,000 yen for each sector of their journey.
It's rare to see one airline offering First Class on domestic flights this days. Good move, I hope it works for JL.