It's not like android, it's not how long you press. It's not heat sensing. It's not what's on the Mac track pad, it's not what is on the Apple Watch. 3D Touch is an entirely new technology and software. 96 sensors measure the actual cover glass deflection, depth of press at the point you press and at the surrounding sensors. This information is integrated with input from capacitance touch, accelerometer, and gravimetric data. This all has been explained in the reveal and can be viewed on the Apple Store site as well as several articles that have been published.
It is by no means the same general concept. Current screens have long touch. For instance long touch the app and you will get into delete and move app mode. Android fans will attempt to dismiss the significance of depth sensing screens. My opinion is that this will be the next generation of touch screens. Per the reviews released today, I am not alone in seeing the advantages.
Four to five years of hardware R&D and software design are not insignificant expenditures for Apple to make. And for some reason I have more confidence in the Apple design team than in any arm chair imore forum texting design engineer that tells me it's nothing new, just like what android has. Course I could be wrong and Apple missed out on copying what android already has.....yeah right.
Until we try different cover glass with varying thickness we won't know if or how it affects the deflection and therefore the depth sense. At the moment we know apples' designer specs document calls out for 0.3 mm max thickness. Is this a threshold limit, a limit with decreasing sensitivity as cover glass thickness increases? We will have to see.