Closed beta tests are confidential. The beta games, including information about features and functionality to be offered as part of the games, are confidential. If you participate in a closed beta test, you must safeguard and prevent unauthorized access to, copying, disclosure, and unauthorized use of the beta games. You will carry out the testing personally and not provide access to beta games to any other person. You agree that breach of the above confidentiality obligations will cause irreparable harm to WN, and WN is entitled to (in addition to any other remedies available to it) ex parte injunctive relief without bond to prevent the breach or threatened breach of your obligations. Your obligation to keep the beta games confidential will continue until WN publicly distributes, or has otherwise disclosed to the public through no fault of yours, each of the games and the content that you are testing.
HOWEVER people are discussing the Closed Beta in the official public forums:
Given that Wargaming.net does not appear to be enforcing their own NDA I'm not going to either on this site unless I hear otherwise from somebody from Wargaming.net or from schild.
Edit: the above ToS page is the license agreement you have to accept when you register for the game:
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