Vex = Old content.
Crota = New content.
Considering the vendors were given gear to completely neuter VoG drops I don't think the Vex will see a buff. They want people to move on to the newer things, the same thing will happen to the Necrochasm come Wolves.
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Vex is an exotic. This is a fact!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Yet it's max damage is still higher than the upgraded exotics. Again don't hold your breath on a buff.