Unless Valve can pull out a huge amount of launch titles this will have a very weak ecosystem of it's own so will have to compete directly against other "gaming PC" companies such as Alienware.
- The Xbox 360 doesn't have a date/time chip. It gets its time from the cloud (Xbox Live).
- The security architectures of these platforms are extensive, to prevent piracy, cheating and malware.
I'm guessing that the days of standardization of console hardware are over; the mobile market has proven that you can innovate and increase power, and developers are happy to comply (as long as there is money in it). You can't /reduce/ computational power or feature sets easily, but you can certainly improve them.