Quoted from the most recent blog post: "Closed survival mode alpha testing is coming to an end! Thank you very much for testing!"
In the past, Notch had said after Survival was released to the public, that Minecraft would officially enter beta, meaning the price may go up. It's not too late, folks. Buy now and enjoy all the premium content yet to come at a lower price!
No it's not. Survival is being released for everyone to play and test, the final game will be survival for premiums only (afaik anyway). It is not moving into beta tomorrow, that will be when we have survival multiplayer (if the plan hasn't changed).