Is that even relevant when not given any timeframe? I can and did believe Notch back when he said it, I don't think he was trying to be misleading, but with no timeframe and the game being the size that it is now microsoft might as well release the source code, yes, 500 years from now.

Can we please get some sort of code escrow system going, similar to how the national libraries collect all published works in a country? Video games are culture too.