
The new 12.9-inch iPad Pro features an advanced Liquid Retina display that goes edge to edge.¹ Face ID, so you can securely unlock iPad Pro, log in to apps, and pay with just a glance. The A12X Bionic chip is faster than many PC laptops and easily runs pro apps. All-day battery life.³ Wi-Fi and Gigabit-class LTE.⁴ Over a million apps available on the App Store, including augmented reality experiences. And the new Apple Pencil and Smart Keyboard Folio help you be even more creative and productive.² It will make you rethink what iPad is capable of - and what a computer is capable of. 
Q: What does “locked” and “unlocked” mean?
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Q: Is this a 3rd generation or 4th generation?
A: undefined
Q: What does “latest model” really mean? Is that a indication of 2nd or 3rd generation?
A: Latest model is to reference that your buying the most current mode released rather than an older version.
Q: What exactly is the cellular portion of this device?
A: Its for data. Say you go on vacation and are riding in the car. The kids or wife can still use the data on your cell plan. I would only recommend this if you have unlimited data. They can use Netflix or prime video streaming. Surf the internet or anything else requiring data. It's not a must but it is handy.