1. You can still use candy corn in recipes if you’re a crafter. Otherwise you can sell it on the TP (although I’d recommend waiting a few months so you can get more profit).
2. It does have a name but it blends in with map colors. It’s called “Fireheart Rise”.
3. I believe for the events it would scale you up, but Southsun Cove is most definitely level 80. The mobs while not undead and so packed as Orr, hit a little nastier. I wouldn’t advise going there as a lvl 66 at the moment.
4. The two POIs coincided with the event. One of the POIs you got was a ship that takes you to Southsun Cove. I believe the other was the POI for the Asura gate that takes you to the new Fractals dungeon.