The hyphen kills it, it will get little type in traffic because of that - most people would try 'sonyplaystation4.com'. Yes there is a 99.9% chance there will be another Playstation but i would be surprised if they call it the 'playstation 4' - they will probably think of a new name for it.
My appraisal: Reg fee right now.
Suggestion: Keep hold for a few years, develop into a website with news about the new play station if and when it comes out.
Problems: Both 'Sony' and 'PlayStation' are trademarks of Sony ltd, you may get some trouble...