Mojang is actually making a Minecraft game for the disk, for people without Xbox Live, and I was wondering, will The End update come out on the disk? That's one of the biggest reason I'd want to buy it.
You can pre-order it at the GameStop website, type Minecraft in the search, and it should be the first one. It comes out April 30th.
Yes, the End update is coming with the retail version of Minecraft XBLA edition. You won't be able to get any other updates after that unless you connect your game to Xbox Live for the download. More details here: http://playxbla.com/minecraftretail/