Dishonored 2 takes place 15 years after the original and they began thinking about it right after the first one was completed.
Emily’s powers will be different than Corvo’s, and she’ll have her own animations and assassinations. However, the story will play out the same way for both characters.
Unfortunately, there won’t be co-op in Dishonored 2 as the developers are focused more on player choice and consequences. Additionally, you cannot switch characters when playing Dishonored 2.
As for the Dishonored Definitive Edition, it’s releasing on August 25 in North America and August 28 in Europe.