Work is still being done on the website, so expect more changes and some temporary bugs here and there.. Feel free to let us know on the forums if you encounter something we might not know about!
The levels, tutorials and documentation sections will be put up over the next couple weeks or so.
Then afterwards the records and “play” sections will be made available as well (when they're ready, that is), together with the next private alpha release.
The timeframe for the public beta depends largely on how good that alpha release goes. But when the bugs are ironed out and so forth, we'll go open beta :)