I do not see why Sony should release new Playstation here. Better graphics? Common, Wii (and XBox original) proves, that pushing graphics forward not reflecting in better sales any more. So Sony focused on Games, Services and Controllers (Wii like controllers) for PS3 right now instead of some Playstation 4 thing.
There are two reasons to create new console now days for Sony
1) If most of the people on the planet Earth will have FullHD TVs, then they will demand FullHD games instead of 720p games, so it will require better hardware. Still there are plenty of FullHD games for PS3 (WipeoutHD, GT5P, GoW3, WKC).
2) If Digital Distribution will become such important as Microsoft want it to be, then it will be wise to create Playstation without optical drive. Still Sony may easy create PS3 version without BD.
So enjoy your Playstation 3 guys. It is good hardware and it will doing good job entertaining you for a long time to come.
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