I just downloaded all of the games I have via the new BC update and now (technically-speaking) have 88 XB1 games; the BC games I have currently are as follows:
A World of Keflings
Alien Homonid HD
Geometry Wars Evolved
Super Meat Boy
Toy Soldier: Cold War
Viva Pinata: Trouble in Paradise
...but that's all besides the point. I just felt like gloating a bit. :P
The point, however, is that I realized some pretty cool things (some of which you may already know from E3) regarding BC:
1. You can now purchase BC 360 games from the Xbox.com website for your Xbox One console, even if you don't have an Xbox 360.
2. Games owned via the Xbox Live Games with Gold promotion that are on the BC list are still available.
3. You can play, message, and chat online with your Xbox 360 friends who don't have an Xbox One console!
4. The games look and run better, if not exactly like they did on the Xbox 360.
5. You can unlock Xbox 360 achievements for BC games.
6. Your saves from the Xbox 360 are intact!
So, when MS says they're expanding their library of games, they really mean it.
This. Is. Awesome!
Feel free to tell me what you think of the features regarding BC that you did or did not know about, while I go finish crying and dry up my tears of happiness again. ;)