The new Terminal A opened for general operations today (1/12/23). Here is a nice description with photos of the interior and artwork to be found there:
New Terminal A at Newark Liberty International Airport
And here is a very useful travel tips page:
Travel Tips - Newark Terminal A
The closets AirTrain station is what used to be station P2 which has been renamed "Terminal A". It is 0.35 miles from the terminal, thus having the Newar Terminal A become llike the SeaTac Airport, requiring a longish walk from the rail station link Shuttle to the terminal. But in an added twist PANYNJ provides a Shuttle Bus service from the AirTrain Station to the Terminal, a 4 minute bus ride. The Shuttle Bus runs every 5-7 minutes.
Looks among other flights to and from MCO, my current home airport, operates out of new Terminal A. So will get to see it sooner or later.