Well a number of users have discovered the 8 categories which are:
Io
Europa
Ganymede
Callisto
Amalthea
Himalia
Elara
Leda
Which as many have discovered are 8 moons of Jupiter. Just like most planets and moons they are tied to Greek Mythology:
Io - daughter of Inachus
Europa - a beautiful Phoenician princess in Greek mythology
Ganymede - a Trojan prince in Greek mythology
Callisto - nymph
Amalthea - the foster-mother of Zeus in Greek mythology.
Himalia – A nymph from Cyprus in Greek mythology
Elara - Elara was the mother of Tityas.
Leda - Queen of Sparta
What are the LOST people trying to tell us? Hopefully more information soon.