I believe the pre-release testing phase is closed already. We are currently working on getting the production version out to the market. We truly appreciate your interest in our product and I could only recommend that you keep an eye on this forum for more updated information regarding the exact release date. I can see that there are some stores such as Amazon* getting prepared for when the product is ready, this might be helpful if you want to purchase it quickly.
I just checked again and unfortunately I don't have an exact date for the release of the Linux* version.
My understanding is that it will be released by end of May but I cant tell you when it will be actually available on the market.
I will keep this post updated.