It's funny, seeing certain parts of the toku fandom report on this and offering
more details than are actually on the website. Literally the only piece of information on the website is this banner and nothing more:

There are no preorders, there's nothing saying it's a "Ultraman Forever boxed set" that's going to contain every series, and nothing about it tying into Ultraman's 50th anniversary that doesn't occur for another three years. Neither is there an actual list of the series included in this. Chaiyo doesn't even have the rights to distribute Ultraman Leo; their claims only go as far as Ultraman Taro, so the "6 seasons" in question could only be Ultra Q to Taro. That wouldn't match up with the touted "over 325 episodes" unless English and Japanese dubs are being counted separately or something, but being so short of information, Rising Sun assuming Chaiyo somehow obtained Leo from Tsuburaya is odd.