The upcoming collection looks to be electronic only (Kindle and such), will be R18 age-restricted, which generally means region-restricted as well, no sales outside Japan without some finagling (VPN, email address, and such)
It'll be a collection of his Pixiv nude series, with new commentary, and the original Pixiv posts will remain in place. If they've found a way to publish them without any annoying censor bars o' shame, then it would be worth the trouble to finesse a JP connection.