The company scored a huge PR victory on Monday when it announced the next gen console would cost £349 (US$399, AU$549) compared with its rival's RRP of £429 (USD$499, AUD$599).
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However, it has emerged that Sony is planning on putting less in the box than Microsoft.
The Japanese company selling the $59.99 (UK£44, around AU$62) camera peripheral, which enables motion gaming and video calling, separately from the system itself
Microsoft, on the other hand, has chosen to make the new Kinect sensor an essential part of its new console and is not offering a version of the console without the motion sensing accessory.
Also confirmed on Tuesday was the presence of an 500GB harddrive within the PS4, matching Microsoft's console. Sony has confirmed that the storage will also be upgradable.