The website does quite clearly list April 15. The date is confirmed in the article they posted:

"Excitement over QuikSpin Continues at Indoor Nationals "

"Of all the questions answered by New Archery Products’ technical advisor Cary Pickands, the most often asked at the 25th annual NFAA Indoor National Championship was “when can I get the QuikSpin?” The good news is that the vane is currently in production and on target for an April 15th release. "