Leak Of The Year
This edition should combine the core game with the previously released DLC, The Knife of Dunwall pack. However there's been no official announcement from developer Arkane Studios or publisher Bethesda about this edition of the game. But if the game has already received certification in one territory it's likely that it will be released sooner rather than later.
In the meantime there's further DLC being released that will detail the end of main antagonist Daud's journey. The yet to be released Bridgmore Witches pack is likely to be bundled in the GOTY edition when that materialises but I'm sure Arkane would prefer you to buy the DLC separately first, possibly explaining why we've not had the new edition officially announced yet. Bridgemore Witches should be released sometime next week so watch this space for more on the GOTY edition after that.