Really hope they'll update them at some point (hopefully soon). It'd be nice to not have to rely on mods for something that should have been implemented in the first place... still upset there's no underwater content in Island Living, like there was in Sims 3 Island Paradise, along with boat houses (that you could move). Hope they do an update to allow that in the future as well. Don't care if it's a separate expansion. For Aliens, I also miss the Alien sleeping pods, hot tub and shower from the Sims 2 (PS2 version). Those were so cool! Mermaids and Aliens definitely got the short end of the stick this time around! No underwater content for the mermaids and everything that it entailed (underwater sleeping, exploration, eating fish and seaweed, swimming from point A to point B by default, ect), Aliens with their broken disguise system (which shouldn't be forced as that was never a thing in previous installments, don't know why it is now) and limited CAS (although it is better than previous versions from Sims 2 and 3), social options, and lack of skill-tree (which Mermaids also lack). There's not even Mermaid or Alien themed furniture (other than a bassinet and mailbox for the Aliens)! I also don't think Aliens and Mermaids should be able to sleep in regular beds. Aliens should have pods like the ones from Sims 2 PS2 and Mermaids should have maybe a hydro chamber or something (along with being able to sleep underwater like Sims 3 Island Paradise rather than just floating on their backs in the water). A giant Clam shaped bed and bassinet that can be placed underwater (ocean and pools) for Mermaids would be really neat!
Also, please bring back the Kraken! Oh, and sharks. 😉