i have xbox live and i checked my minecraft like a half hour ago and its still on tu14...
Make sure you have a secure connection and can actually play online. There was/will be an update when minecraft launched (TU15 and TU16). If you can play minecraft with your friends via xbox live then you already have it and didn't know it.
In the update information it will still say tu14 even if you updated to tu15, so if you are able to pay online mode on xbox live then it is safe to say you have tu15. Easy way to tell is in game if your left most hot bar item snaps into your inventory when you open inventory by hit y or if it stays on hot bar.
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RESPECT goes a long way. I have worked hard on my worlds. If you are nice, share, don't pvp, and do not destroy we will get along just fine.
WHERE IS TU15!