Jellyrolls is doing a NYE party, but that would be restricted to the over-21 crowd. There may be events at the Disney Springs restaurants as well. The CR does a "Countdown to Midnight" party that comes with a premium price tag (and might be sold out at this point).
In the past, the MK resorts have restricted their beach areas to guests staying at their resort. They go so far as to remove the chairs from the 1st floor patios at the Poly (to prevent people from moving them to areas where they can see the fireworks) and giving wristbands to guests of the property so that they can keep non-guests out of the beach area.