During pre-show events at E3 Bethesda decided to release information about a few games including Dishonored 2, Fallout 4 and DOOM. All three of these games have been staples in the gaming community for a number of years and all three (if done right) can expect to continue their respective names well into the future.
If there is one constant in gaming it is the sequel. All a game has to do is sell a little bit and developers will find a way to make a part two. Now, if the game is a big hit, like say Dishonored, then the chances of a sequel are pretty much 100%. This is why the leaks about the next installment of Dishonored did not surprise us.