The biggest thing I've hopped for DLNA on PS4 was that its wireless is better than the PS3's which leads to a better streaming performance.
Even with SD content and a perfect connection I always had freezes during videos. That's completely gone on PS4. In fact, once a video is started you can skip around the video instantly, pretty awesome performance.
I could finally ditch the LAN cable I had to use for the PS3 across the room
Still, no more divx/xvid codec support sucks. I have tons of old video encoded in that because they still played all fine on the PS3... I wonder if I should just accept it's never coming or if they might add it later. The XB1 supports it after all...
Does anyone know if the Plex PS4 app supports divx/xvid?