OK, so instead of going to Hoboken on the PATH yesterday, I had to instead go to NYC first on a NEC train, so on the return trip back to Newark today I managed to get on a NWK train at Grove St. and get a decent seat up front at Journal Square.
There is existing catenary in two sections...I was only paying attention to the track I was on, but I imagine it's probably the same on the other track.
Starting from halfway across Hack, the catenary begins there and runs to signal 753Z. This video below is shortly after getting off Hack.
The second section starts right after the red trestle overpass that I think is the waterfront connection? (correct me if I'm wrong)
This runs all they way into Harrison to where there is a bend in the track to get the train right up next to the platform, as seen in this video(sorry about the shakiness)