Asoka has been released in Granado Espada: Russia since April 20, 2011 in random boxes sold via Cash Shop. The sale of boxes has been extended to May 4, 2011. Other loot includes Jade Phraxi and Raid Phraxi costumes for scouts. See Асока уже в Новом Свете! and Сундуки в продаже до 4 мая!.
[Sword2] Unleashing Asoka
Quinzel has updated information regarding Asoka Limited Edition Set here. There will be only 500 sets, and each will include Asoka Character Card, 3 Silver Phoenix Wings (permanent), and 13100 Gold.
The first 250 sets will become available on May 3, 2011 (5pm PST), and the remaining 250 sets will become available on May 4, 2011 (9am GMT). Each set costs USD 85.00.
According to this, Kurenai will be released shortly after the limited edition sets. [Sect of Moonlight] stance book will "very likely" become available in Feso Shop "close to around Asoka LE set release".