According to sources familiar with company plans, Microsoft is preparing to roll out an update for the Xbox 360



From WP Central:

This package will implement changes to the dashboard UI and will enter into a public beta in late June or early July. Said changes are believed to be in preparation for the next-generation console, which Microsoft will be announcing soon. The Verge has learned that the dashboard will be refreshed with small Live Tiles to match what's presently available on Windows Phone as well as Windows 8.1. Darker or lighter themes are also touched on, providing more customisation for consumers.

  Microsoft to roll out Xbox dashboard UI alterations before next-gen console