According to this website they plan to start accepting reservations in April. Although the article is in Japanese it includes some nice photos, a few more than on the hotel's website. I hope it will be a good alternative to Hilton properties in Tokyo, the prices of which are currently astronomical. I had a two-nights reservation at Hilton Tokyo in April 2020 which had to be cancelled. A similar two-nights stay this April will cost 2.7 times more!