I always got the impression that sony meant that the ps4 would only appear after a 10 year reign for the ps3. However, the huge increase in pc power as well the xbox being fairly similar in power to the ps3 have meant that this really wouldnt be a smart move, especially since the xbox (nor the wii) are 10 year consoles. Sony would have seen this and planned acordingly and hence we will likely see a launch this year or 2014.
Having said this, I in no way think that sony lied or betrayed us. When things change you have to adapt and now that the Wii U is already out and the Xbox 720 is coming soon, it only makes sense for them to bring out their console now. Anyone who thinks sony betrayed them is an idiot and you really shouldnt be wasting time on them.
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