Well, I've been expecting it all year and it got announced today on BBM's website: a set commemorating the 20th Anniversary of Orix buying the Hankyu Braves. The team played as the Orix Braves in 1989 and 1990, then called themselves the Blue Wave from 1991 through 2004. Following the 2004 season, Orix merged with the Osaka Kintetsu Buffaloes - well, absorbed is probably a better word than merged as Orix remained and Kintetsu got out. The new team was the Orix Buffaloes.
Instead of the usual 99 card pack-based sets that the other recent anniversary sets have been, this is a 55 card box set. There are 33 cards of former Orix players, 15 cards for current Orix players, a six card "Scenes" subset (showing important events in Orix history) and an insert card (which could potentially be an autograph or memorabilia card).
The set should hit the stores in December.