Holy's theories based on the drawing and other tidbits:

LNC > DRG (general DRG styling, but is close to DRK, yet still carries a polearm weapon I believe to be a Guisarme)
MAR > WAR (warriors wield axes in previous FF, + red accents)
PUG > MNK (obvious)
CON > WHM (skill set, multiple raise tiers etc)
ARC > BRD (harp embedded in bow)
THM > BLM (skill set and in-game lore)
GLD > PLD (obvious)