After SP15 Moschino which really improves and extends the photography gameplay from EP01 Get To Work, do you think they should do the same thing about the aliens ?
About The Sims 3, Vampires were in Late Night EP and Maxis revamped them in Supernatural EP.
About The Sims 2, Zombies were in University EP, FreeTime EP and Apartment Life EP.
Maxis is able to repack or revamp a life state in a new EP. For example a Future themed EP could update the aliens.