I know I'm a little late into this, but I've found a decent selection of petites at J.Crew this month. They include:
Petite meringue-sleeve top
Petite Super 120s Jayne dress (I like the tea rose colour)
There are also several styles of skirts and capris in petite sizes. It seems that J.Crew makes a lot of petites one month and then next-to-none another. Kind of strange, IMHO.