Sources familiar with the matter have told Developer-Online that Sony and Microsoft are currently developing their next-generation of hardware.
One of their sources claims that Sony has their studios working on several internal projects for the PlayStation 4, although that same source didn’t cite which studio was tasked for the job. We also shouldn’t expect to hear anything about the PlayStation 4 for quite some time for the following few years will be focused on the PlayStation 3 and PS Vita.
Another source claimed that Microsoft and partners are currently working towards a 2013 launch for the next-generation Xbox with multiple sources including chip manufactures and middleware firms point towards a E3 2013 unveiling.
Source: Develop-Online PS4 Article
Source: Develop-Online Xbox 360 Article