That's so weird, last night I was around the union square area and spotted that bus and that bus didn't have any ads until today.
However, great spotting of that bus.
Hopefully, they put more trailer ads on the other buses at MJQ and other Manhattan Divisions.. That's the only depot in the city that I find very sophisticated with the ads.
Also, hope they can expand those ads to the Brooklyn Division (FB/ENY/GA/FP/JG/UP)
Unrelated note: JG finally putting ads on their XD40's. 769, 772 are the only ones I've spotted so far.