As someone that played a lot of Diablo 3 on the PS3 I can tell you that the leap over to PS4 is a very satisfying one. Not only do you get all the new content from Reaper of Souls as well as a new class of character, but you also get to play adventure mode and build your Paragon Level.
Here is a video of the all new Diablo 3: Reaper of Souls – Ultimate Evil Edition content and a quick explanation of: Adventure mode, Blood Shards, Nephalem Rifts and Bounties.
Enjoy and get ready to save Sanctuary by defeating Diablo and Malthael. Let me know your thoughts in the comments.