There are eight main menus to choose from with settings like output video resolution and audio via HDMI or Toslink, but there are also some nice additions like the ability to skip startup animations and sounds.
Detailed in a message sent to testers this evening, there's also an update rolling out in the next 24 hours that upgrades video output to 1080p and exposes settings for the Echo like optical audio out, bitstreaming over HDMI or optical and diagnostics.