Hold off on collecting that vendor/faction package at the postmaster. Leave it in the mailbox until after the DLC drops. I've heard whispers around the forums that the Devs may slip commendations into the packages upon release of the DLC. Not confirmed, but worth a shot.
If you haven't leveled your faction/vendor yet, DON'T LEVEL UP! You will be assured to get commendations from leveling after the DLC drop.
Good luck, Guardians!
Edit: please bump to share with your fellow guardians, this topic is nowhere to be seen in the forums.
Edit: also save any legendary engrams until post-DLC.
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2 times this weekend, but at least i got a cool shader.