hypnosec writes "NVidia has now open-sourced the operating system that powers the gaming console to encourage its modification and further development. Powered by NVidia's homegrown Tegra 4 processor, the console runs Android, which shouldn't surprise many as the company moves ahead with its open-sourcing intentions. The GPU company has said that the SHIELD is an 'open gaming platform' that allows for 'an open ecosystem,' enabling developers to develop content as well as applications that takes advantage of the underlying hardware and which can be enjoyed on bigger displays as well as mobile screen."
Playing with it isn't without risks (like potentially voiding the warranty), but NVIDIA's blog post
says they're also providing a recovery image to fall back to.