According to the listings, which have been highly accurate in the past, the card will a double world title card with supporting bouts featuring an OPBF title bout and a Japanese title bout.
One of the world title bouts is the previously reported WBA Flyweight title contest between defending champion Kazuto Ioka (19-1, 11) [井岡一翔] and once beaten Nicaraguan challenger Keyvin Lara (18-1-1, 6). For Lara the bout will be his first world title challenger whilst Ioka will be looking to continue to continue his reign, and potentially move towards a world title unification bout later in the year.
Ioka Vs Lara is no surprise, it's been hinted at for several weeks and was known to be Ioka's most likely bout. The other world title bout, listed on the ticket website, is an IBF Super Bantamweight world title bout between Shingo Wake (20-4-2, 12) [和氣 慎吾] and Jonathan Guzman (21-0-0-1, 21). Officially this bout hasn't been announced, much like the Lara Vs Ioka bout, but has been known about with the teams of the two men told to negotiate a deal several weeks ago. Unsurprisingly it is thought to be the co-feature of the card and, like the Ioka bout, will be expected to come with TV coverage from TBS, who have shown Wake's recent bouts.
As well as the two world title bouts their is also an OPBF Bantamweight title bout listed, with Takahiro Yamamoto (17-4, 14) [山本 隆寛] defending his title against Filipino challenger Rex Wao (11-2, 9), who is sadly a fighter coming into this one following 2 losses in his last 3 bouts, and a Japanese title fight with Light Middleweight champion Yuki Nonaka (29-8-3, 9) [野中 悠樹] defending his title against Ryosuke Maruki (12-3-1, 7) [丸木凌介].
Whilst the card hasn't been officially announced, and none of the bouts have been formerly announced either, it does seem like this card is a go-er and the announcements will come over the coming days. Interestingly Pia list the advance tickets as being available from this coming Saturday, meaning that announcements will be coming very shortly.