It's possible we may see a simultaneous launch of Reaper of Souls on both PC and PS4.
Earlier in the month, Diablo III console senior level designer Matthew Berger told us that the game's first expansion pack, Reaper of Souls, will come to consoles, but "we don't exactly know how we're going to do it yet". It looks like they have figured it out, as the official PlayStation blog has announced the expansion will be playable at Blizzcon, both on PC and PS4.
"Attendees of the convention will also be some of the first in the world to take on Death itself using DualShock 4, armed with all-new social features and touch pad technology designed to help keep heroes on focused on what they do best: killing monsters."
Reaper of Souls was officially announced at GamesCon this year, and will feature a new class, a new act, a new artisan, and a plethora of loot and adventuring improvements. In true Blizzard style, it doesn't have an official release date yet, but we can probably expect it some time next year.
While Diablo III has been released for Xbox 360 and PS3 already, the Xbox One/PS4 launch also won't happen until 2014. Considering that the expansion is already playable on PS4, it seems somewhat likely that the next-gen release will combine the original game with the expansion (or at least, we will see the expansion launch shortly afterwards).
No word has been offered on when the expansion will make it across to current-gen consoles, but Berger said earlier that "we have to make sure that it is adapted to the console eco system in a way that is going to play the best way possible," and that this will take some time.
BlizzCon takes place November 8-9.
Source: Official PlayStation Blog