1 - Will the pilot get fined (FAA, NTSB, NYPD, parks authority,
anyone)?

As Far as the FAA was concerned, he was simply (and successfully)
exercising his Pilot-in-Command power to bring is flight to a safe
conclusion after a minor emergency. The FAA specifically gives the
Pilot In Command final authority in all matters governing the safety of
his aircraft or people on the ground.

2 - How much does it cost to remove the wings from a Cessna and
transport it to the nearest airport?

Not sure about a Cessna... there are about two-dozen bolts which hold
the wings on to my piper... The Cessna is in better shape because the
landing gear are affixed to the fuselage, unlike my Piper which are
affixed to the wing, but I don't know how 'straightforward' the bolt
removal process is in the 172s. A couple hours of labor maybe, plus
the cost of the rental truck. Not horrible in either case (rough
guestimate ~500-750 bucks)

3 - Is the pilot's overconfidence-verging-on-arrogance ("non-event,"
"walk in the park") at all off-putting to others? (He sounds like an
arrogant jerk who should be thanking his lucky stars - but that's a
non-pilot's opinion.)

How is flawlessly performing the actions he's been trained to do
verging on arrogance? If anything, I applaud the pilot for (correctly)
playing down the situation. There is a general consensus among
non-pilots that loosing an engine = airplane falling from the sky...
its simply not true. We train for it... It happens, its a contingency
that we're expected to deal with if the situation arises.

The pilot seems to me to understand that local media would be trying to
blow this out of proportion like they do all aviation accidents... he
played it down as not a big deal because, well, it really isn't that
big a deal. Its not like he's looking to be called a hero, or basking
in the media attention, or anything like that - he did what he was
trained to do when something went wrong. Period, end of story.

That's hardly arrogance.

4 - Will his insurance go up?

Considering his aircraft was undamaged, and the process of removing the
wings, fixing the engine and re-assembling the aircraft are all
maintenence issues (not aircraft incidents, therefore not covered or
cared about by insurance), probably not.