Nintendo had this in the plans all along. They fabricated earlier reports saying Revolution would not be shown to give Sony and Microsoft a false sense of security. Especially Sony, who has no reason to worry about competition with Microsoft.
With this surprise attack unleashed, Sony and Microsoft representatives are probably unloading in their pants as they scramble to up the ante of their presentations in order to compete against the unexpected arrival of the Video Game King.
Strategy:
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And Nintendo slams another one out of the ballpark!