Yes you can, the demo just has a time limit.
Yes. You can also play four player split screen.
No
The xbox 360 does allow split screen compatibility already.
you cant because it has no split screen
You'll need a friend with you in real life, so you can share a screen. Your friend will have to add their controller, and then you can play. As for XBOX Live, split screen isn't needed as your playing on different consoles. Just invite them to an XBOX party and you can invite them to your minecraft game, no split screen needed.
If you are referring to the Xbox version, yes you can! The only downside is that you have to have HD to play split screen.
If you are referring to Minecraft for the Xbox, then yes, you need to have a HD TV to allow splitscreen.
When would Minecraft Pocket Edition 12.1 going to be out
To play Minecraft split-screen with one controller on Xbox, first ensure that your console is connected to a TV and that you have an Xbox Live account. Start Minecraft and load your game or create a new one. Connect a second controller (if available) by pressing the Xbox button, and sign in as a guest or another profile. If you want to play with just one controller, the split-screen mode will allow you to share the screen, but both players need to be signed in for full functionality.
If you wish to play locally (with yourself or someone else via split screen) then no. If you wish to play over the internet, then yes.
You can not play split screen on multiplayer. It also left me confused