Officially, the game that you can purchase from minecraft.net is the beta. Technically, that means that the game is still being tested and developed, even though. The beta has been out since December, and free classic version came out back in May 2009. The game will see an official release in November of this year, meaning that millions of people have been playing a game for over two years that hasn’t actually been released.
Another fun fact about Minecraft: it was made by only one person!
(Sources: 1, 2)
19 Astonishing Facts