I noticed this as well. Seems like a valid theory.
To expand, the icons for the subclasses we have seen correlate with these as well.
Gunslinger was an orange icon, blade dancer was light blue.
Striker was light blue, Defender was purple.
Voidwalker was dark purple and Sunsinger was orange.
English
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Edited by USSR RISING: 8/3/2014 7:42:04 AMDefender is the other titan sub class we know of