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What is point of this statement?
Its somehow bothering you that some people would like to know? O_o
And if so ... why?

The point is disagreeing with your premise. Disagreement does not require me being bothered.

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Presuming reviewer will receive his copy in advance enough to get in Act II. ... wich as we know (funily enough from FAQ) qoulsn be possible with regular game until final release date.
Presuming s/he will try it.
AND presuming s/he will mention it in that preview.

Reviewers will be given time to complete the entire game. There will be dozens of reviews. It is inconceivable that none will mention this feature if it exists.

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What is FAQ for?

Providing information about the game.

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IF that is the case ...
I cant imagine anything easier than simply say so.

Doing nothing is easier than saying so.