Microsoft's Don Coyner has stepped down from his position at the head of the Xbox design and experience group, CNet reports.
According to two unnamed sources within Microsoft, Coyner will be replaced by Emma Williams, who oversaw the recently launched redesign of the Xbox Live dashboard.
Coyner joined Microsoft in 1995, and began working on the first Xbox console as director of marketing in 1999. He assumed responsibility for user experience during the development of the Xbox 360, and is widely credited for improving the aesthetic standards of both the console and Xbox Live.
The sources claim that Coyner will remain at the company, though they did not reveal the nature of his new position.
Williams will be responsible for evolving design strategy for the Xbox group's new console, which the sources confirm will launch in 2013. Microsoft has so far declined to comment on the matter.
The Xbox Live dashboard update implemented the tile-based Metro interface used on Windows Phone 7, expanded the service's multimedia content, and integrated multiple search options.
Earlier this week, a Bloomberg report suggested that Microsoft is also actively seeking a television executive to produce original content for Xbox Live.