It was suggested on the official forums that people who missed the original registration should be allowed to enroll for the fourth phase of the beta test. Fabrice found the idea interesting and strated taking applications. So take a look at this thread and post a reply if you are interested. The number of new recruits has not been specified, but it is worth taking a shot. It's probably the very last chance to join the closed beta.

Fabrice also had the following to say: "Regarding the open beta, it will not be limited to people who actually subscribed back in september." So a large number of fans will be able to try a polished version of the game before it comes out. Good, very good.

update: it looks like Fabrice is not taking any more signups, according to the post in the above mentioned thread here