I think the only time Apple revealed how much RAM one of their devices had was in the new iPad keynote (iPad 3), probably because they were embarrassed that the A5X had no increase in CPU performance whatsoever, so they had to make up for itthis is what Apple does. In fact, they always do this.
Apple doesnt like to compete with a spec page but rather have the actual device compete. On paper they never look good but ALWAY trounce their competition in real world test.