Sony has also held a meeting to show developers exactly what the machine can do. More are planned for the coming weeks. The kit is being called 'Orbis', and isn't referred to as the PS4 just yet.
Orbis is based on AMD's A10 APU series. This includes a combined CPU and GPU. Each dev kit contained either 8GB or 16GB of RAM.
Sony hasn't made any official comments on the state of their dev kits.