While the Sims has been very pro LGBT, this is the first time that a Gay Sim has been shown in the child lifestage.
The Sims in this trailer are available to download from the gallery, and it would seem all four Sims in the trailer have a crush on the Mystery T shirt Sim.
It seems EA is becoming less and less concerned about "keeping it safe" especially when these trailers are available in Russia, which gave The Sims 4 an 18+ rating because of same sex relationships and marriage.