You know the PS4 release is getting closer when titles start showing up on the PlayStation Network on the PlayStation 3 for digital pre-order.
It has been revealed that upcoming PlayStation 4 titles, Knack and Warframe are currently available to pre-order digitally on the PlayStation Store with more set to follow.
The news was confirmed on the official PlayStation twitter feed which stated:
Will you be pre-ordering any of the above titles? Let us know your thoughts via the comment section below.
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