Via Response.jp:
Toyota has received 7,000 orders for the GT86 since taking orders on February 2nd. As 1,000 units a month will be delivered there is up to a 7 month wait depending on the trim level.
Currently, the GT/GT Limited grade has the highest pre-orders and will require a wait till September. G and RC grades can expect delivery in May.
Initial deliveries in Japan will start next month on April 6th:
http://response.jp/article/2012/03/06/170980.html