In the last 24 hours or so the WBO have released their updated rankings and confirmed that Fukuhara is indeed regarded as the "full" champion, having been upgraded due to Takayama's decision to leave professional boxing.
Although it wasn't confirmed by the WBO it does seem like Shinsei's plans to have their fighter, Ryuya Yamanaka (14-2, 4) [山中 竜也], challenge Fukuhara will come to fruition with Yamanaka currently holding a WBO #1 ranking.
At Bantamweight it's worth noting that Zolani Tete, who beat Arthur Villanueva in a bout for the "interim" Bantamweight title, has also been upgraded to being the full champion. Presumably he'll have a mandatory due later in the year, potentially against former Naoya Inoue foe Omar Andres Narvaez.
(Image courtesy of boxmob.jp)