In terms of rear-facing ports, the new, even slimmer model is identical to the Slim, offering Ethernet, HDMI, Opticalout, RCA and a spot for the AC adapter.
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.