Natalie here!
Although no date has yet been given for when this update will be with us miners, the details have been released as to what it will contain.
There are hyperlinked pages for The End, Spawn Eggs and Flame Charges taking you to Minecraft Wiki for information on each thing :)
Firstly, we shall see changes to the xbox 360 version of The End - we shall finally get the Ender Dragon! And it breathes 'Ender Acid' which is exclusive to Minecraft Xbox 360 Edition!
The exit from The End shall spawn when you enter, but will not be active until you have killed the Ender Dragon.
There are also things called Ender Crystals, but these are being tested and it is not confirmed wether we shall get them in this update or the next.
In addition to the changes to The End, there are also other changes in this update.
There's an option to reset The Nether, Spawn Eggs will be available, sheep will regrow their wool when they've eaten grass (useful to minecraft farmers like myself!), beaches will be re-added, bowls will become stackable to 64, vines can be used as ladders, birch and spruce wood planks, slabs and stairs, sandstone stairs, Fire Charges, buckets stackable to 16, wooden buttons, Netherbrick slabs and Netherbrick can be mad by smelting Netherack.
Planned features for future updates include texture pack support, which could be great fun!
When I find out a date for this update, I shall make sure to post it here for you guys.
Happy mining!!