They have to sign a confidentiality agreement, agree not to spill any information before the official product announcement, and delete all "unannounced HP product information, including postings made by participants in the website or forum within 48 hours of the posting" or risk being kicked out of the evangelist program (which means no hook ups on reviews) and face possible legal action by HP.
But the performance of Hook was one thing to bring a smile to the New Zealander's face, not least that fact that the Ospreys centre is now claiming interception tries rather than throwing them.