Minecraft will launch sometime in August 2014. It will cost $19.99, but for those that own the Xbox 360 version it will only cost $4.99.
Cross saves have been confirmed so you can transfer your Minecraft world from the Xbox 360 to the Xbox One version. The Xbox One maps are supposed to be 36 times bigger than the Xbox 360 ones.
To prepare for the release, check out the trailer from E3 2013.