Would you want out of a Sixam / Alien dlc?

No but I want all Supernatural life stages to get an overhaul so that Mermaids and Aliens are as detailed as Vampires or Wizards.
Skill tree, meaningful special abilities...

I also want the masquerade to be meaningful. The whole idea that "look, aliens are wearing a disguise... btw there is Alien Night at the bar tonight and all of them are walking around in plain sight. Logical, innit?" is so DUMB, quite honestly, from the devs side. It obviously means they threw away an entire gameplay mechanic for a laugh.