I don't know what Unknown Player has said just yet, but generally the most popular YouTubers like him have already gotten inside information, which is what allows them to post reveal videos with details not found most elsewhere. Some companies love to contact and give bits of early info to "ambassadors" who are community members that champion their product/service and have a large following.
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I kind of glossed over his video and didn't catch anything related to news of weapon balancing, although it's possible I missed it. More or less, I know some youtubers are also view-whores and like to make those claims even if they [i]don't[/i] have the contact from bungie because they know people will believe them, so I tend to wait until someone actually comes and outright says something.