Original: Neptune Trojans (named by analogy to Jupiter's Trojan asteroids) are Kuiper belt object-like bodies in solar orbit that have the same orbital period as Neptune and follow roughly the same orbital path.
Simplified: If any other L5 Neptune Trojans are discovered in the near future, it may be possible for the New Horizons spacecraft to investigate them as it passes through the region in 2014 while on its way to Pluto.