This won't spoil the actual game in any way, so don't worry, but there's a unique little bonus included with copies of Portal 2.
Portal 2 Comes With An...Interactive Movie Trailer?
Source: Kotaku (opens in a new tab)
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Source: Kotaku (opens in a new tab)
This won't spoil the actual game in any way, so don't worry, but there's a unique little bonus included with copies of Portal 2.