The distribution of beta software is becoming much more open these days with the new adopted model of distribution to subscribers of Fileplanet. The new Crysis multiplayer beta is the latest title that will see key distribution using the Fileplanet subscriber only approach.
As has happened recently with many other titles, the distribution will use a staggered distribution model with keys being released a little at a time to Fileplanet subscribers over the next couple of weeks. Of course, these requests will be on a first come, first served basis. Fileplanet has indicated that there will be four total batches of keys to be released.
While the multiplayer beta is kicking off now, the single player demo is anticipated for release on September 25th. The game itself is expected to ship in November, but an official date has yet to be released. The actual release is rumored to be targeted for November 13th.