The talks have been private, as opposed to Sony's PlayStation 4 discussions
This doesn't mean that Microsoft isn't talking about the Xbox 720 with developers, as Epic Games' Mark Rein told CVG that Microsoft did have a private presence at the Game Developers Conference last week.
"I don't think with developer relations anyone is trying to be public, it's just you're at GDC and Sony has the hardware to talk about, and Microsoft hasn't talked about it publicly yet. So I think it's just the difference between someone who can say the name of their console and someone who can't," Rein said.
According to recent rumors, the Xbox 720 will be revealed at a press conference on May 21.