Just to clarify as some people are a little confused on the 757 release status, and call it "Beta 4", "open beta" etc :)

The Beta 4 was released for in-house testing in December and never was available for purchase. Even after the poll was 87% YES.

After the Beta 4 we released for in-house testing Beta 09. Which never was available for purchase either.

The current (and the only) version available for purchase is 1.0, which was never announced or advertised as Beta.