According to Marc, this is when Xbox One evolves from specs and theory to reality, and in order to ensure the console is working flawlessly, the team has kicked off the Xbox One internal beta. Xbox One consoles are currently in the homes of lucky Microsoft employees who are putting it through its paces and working closely with the development team to get everything ready for launch.
In the podcast, Marc also talks about the work the team is doing to maximize the power of Xbox One’s hardware. For example, during Xbox One’s product development, they increased its GPU clock speed from 800 MHZ to 853 MHz. In addition, since E3, a new graphics driver, internally referred to as the “mono driver,” has been installed and is 100% optimized for Xbox One.
You can listen to the full podcast on Major Nelson’s blog.