I don't think we would ever get preteens. Because first of all preteen is literally any age below a teen?
But I know people mean like 11 12 I guess?
I was playing around with kids today and as much as I like to imagine they are about 7,I honestly think they were meant to be what people consider preteens. If you compare them to sims 3 kids you can clearly tell they are older.
If you dress them more teenish and make the right faces in CAS they literally look like 11 12ish 10 at the youngest.
So if we get preteens for me it's just going to be so awkwardly similar and I don't understand what difference or changes they could make. It would be like a duplicate lifestate. Just my opinion though.