My findings after the leak on 95music:
Today, an entry of Subarashi Sekai was added to the definitions of the discography page. Subarashi sekai is tagged as belonging to the article with catalogue number SRCL-8499 (the RE of the album as per 95music):
Also, the catalogue numbers are interesting. Why?:
1 - Catalogue numbers follow an order (obviously). Gr8! Records releases get classified under the standard Sony Records catalogue numbers (SRCL-XXXX).
2 - The same day the album is supossedly being released, there's an UVERworld single being released too, with catalogue numbers SRCL-8648~9 and SRCL-8650.
3 - The catalogue numbers for FF's album are 8497~8 and 8499.
Same day release but almost over a 150 difference in catalogue number?. This simply means that the album was either originally going to be released earlier this year or, atleast, planned and registered long ago. When exactly? Well, if we search for, for instance, what would be the previous release to FFs album (SRCL-8495~6) we find a Fukuhara Miho album that was originally released on March 26th (YUI's birthday)!. So yeah, the album was probably originally scheduled to be released (or just planned) around the end of March or the start of April. Oh, btw, Fukuhara Miho is from Gr8! records too :p. http://www.sonymusicshop.jp/m/item/itemShw.php?site=S&ima=0058&cd=SRCL000008495