Fabien from TDU2.fr confirms the beta hasn't started yet, but according to Nadal, it is VERY close (it is "burning", to use his words). This info was released on July 31st.
As I quoted before, the beta will be very limited at first :
Only a few people (one hundred) will be accepted for the first "round", then slowly it will be expanded. The reason is they want to test servers and multiplayer gaming without having an overcharge, etc.
The beta will include only ONE car and freeride mode, nothing else (at least when it starts..)
Fabien continues to say he got one beta key for himself and another for another person on the forums, confirms about the NDA thing and also about the fact that beta testers will have to write reports and other feedback, maybe on the facebook page of the game.
Finally, Fabien will have some exclusive media he will be sharing with the french community of TDU2.fr, so stay tuned for more. This media won't be from the beta, but it will be given to him by Eden exclusively, for which he has the right to publish.
Taken from the official forums.