Here are the latest rumours about the specs for next gen Microsoft and Sony. Theses are supposedly coming out of CES, so perhaps they have more wieght.
Next Playstation: 1.84 teraflops run time capability, 4 GB ram (1 GB for system OS, 3 GB for games).
Next XBox: 1.23 tereflops run time capability, 8 GB ram (3 GB for system, 5 GB for games).
Link to original article.