Is below the full list of things you can do with BC games?
1) Xbox, Take A Screenshot
2) Xbox, Record That
3) Twitch broadcasting
4) Suspend/resume
5) Snap
6) Within a 360 game, use cloud saves
7) Within a 360 game, earn achievements
8) Within a 360 game, bring up the 360 guide to check achievements, start parties, check friends list, messages, beacons, etc... (but no media/music/marketplace blades)
9) With a 360 game, receive toast notifications for online friends and achievements
10) Use voice commands and Kinect to launch a 360 game, i.e. "Xbox go to Fallout 3"
11) XB1 Party chat while playing 360 games
12) Multiplayer with 360 games (i.e. play Mass Effect 3 multiplayer on XB1)
13) Game sharing with 360 games (i.e. anyone on your home xbox can play the digital version of Rainbow Six Vegas)
What else? Has it been confirmed that DLC works? Can you guys play Bring Down The Sky and Pinnacle Station on ME1?