Hmm, if it's something you can opt to play with over GF, it might not be burglars, unless it takes a more active form.
I can see it being improved babies or CAW. The first one because nobody ever takes footage of babies, so there's some plausible deniability, although the gurus also said they're not the highest priority life stage IIRC. CAW is possible because people have said the goers didn't explicitly deny it and they did make more room in the world selection screen, but it would also take a lot of changes given the game's static worlds.
I'd say CAW would impress me the most
Edit: Oh, and also, "small but fun" could refer to babies like others said
