From my experience from playing a warlock past level 20. This is the gear that I get.
green= 102% chance of axiom coven
blue gear=locus watcher, axiom coven, and some other set I don't remember.
Legendary= legendary engrams exist, not sure about legendary gear though.
Isn't it a little weird that Warlocks so far seem to have 3 sets of rare gear?
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Some of the rare gear has hilarious names though. I have a crap hand cannon, but I kept it because it's name is NIFTY_BISCUIT. There are a bunch more, but that one was the most memorable, as I was hungry at the time.