Hobgoblins' eye changes based on whether or not it can use Thermal Barrier. I've killed well over 10,000 Hobgoblins and yet not once noticed this small detail until I was just mucking about with the HUD off.
[spoiler]Left: On cooldown
Right: Active[/spoiler]
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The details in this game are amazing.I was taking screenshots of my Warlock sitting in the tower hangar in her speeder suit and I noticed when she sits her thighs flatten out just like a real person's would upon sitting that way. Stuff like that is just cool AF,IMO.