http://www.twitch.tv/beamng#8313 Stream here, but nothing really being streamed just info from a dev in the chat.
http://www.beamng.com/info/game has all the information on the demo and alpha access.
https://dl.dropboxusercontent.com/u/30377576/Bea... Download link of the tech demo from my dropbox since their servers are getting pounded, uploading as I type. Should be up in 20 minutes or so.
Tech demo only contains the pickup and the test map, but the alpha will contain all reasonably completed cars and maps. Alpha will cost $15.
Edited to replace info link.