Please let us know if it has wi-fi. Guessing the answer is no, but this EWR-based flyer treks to JFK specifically to get planes with wi-fi. If the "temporary" birds have no "temporary" wi-fi, I'll stick to regular 737-*'s and such out of EWR.
Most JFK flights still are normal 3-class ps planes. A few are these PMCO 757s. The 3:30pm JFK-LAX flights seem to have the PMCO planes as standard for now.