Think of it as the "one with the lot" edition — it's the Elder Scrolls Anthology, and it really does have it all.
For AU$99.99, it's all five Elder Scrolls games, all the official DLC and even five physical maps, detailing Tamriel, Iliac Bay, Morrowind, Cyrodiil and Skyrim.
The full list of titles and add-ons is:
The Elder Scrolls Arena
The Elder Scrolls II: Daggerfall
The Elder Scrolls III: Morrowind Game of the Year edition; plus Tribunal and Bloodmoon
The Elder Scrolls IV: Oblivion Game of the Year edition; plus Knights of the Nine and Shivering Isles
The Elder Scrolls V: Skyrim Legendary Edition; plus Dawnguard, Hearthfire and Dragonborn.
And, yes, for the purists, this is only for PC. It's available now and rated MA15+.