It can be for legal reasons, or at least the preference of the company that's helping you, but primarily it's to restrict information.
1) Keeps the competition from knowing what they're competing against.
2) Reduces the risk of public excitement peaking too far in advance of product release.
3) Prevents release of information that is likely to change in the future, staving off disappointment. Remember when JAW announced it would be working on Hand of Odd, and how we're not actually doing that? Remember Fangus? And Munch's Oddysee?
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