So that article didn't confirm the proscenium at all, it confirmed a new marquee which is different.
Prosceniums are the arches over the stage/screen of a theater, which is what WDW has.
A Marquee is what resides over the entry of the theater itself. Often times it's advertising what's playing, and that's what's being added.
As for PM itself, while they're clearly doing more then what DLP did for theirs with the projections on the side and a Donald statue (It's no AA.), I'm in the boat that would've preferred they'd actually put the time and money into reconverting the whole theater to have a proper Philarmagic 2.0 like what was originally planned way back. Trying to sweeten things with the projections on the side doesn't really work when you have it chopped up by thick vertical beams, plus the larger balconies flanking the sides of the main screen.