There are eight reference numbers here, again perhaps referring to the needs of different markets, different storage capacities but also, this be a tablet, whether the tablet is wi-fi only or has cellular capabilities as well.
There are currently two storage capacities for iPad Air, 64GB and 256GB, each in wi-fi and wi-fi and cellular versions, so that’s four of the codes spoken for, theoretically.Sometimes codes appear and are not used, sometimes one code can be used across several versions – the current A2316 code refers to the iPad Air 4th generation, and isn’t related to the storage capacity, while there are three codes for the same tablet in its wi-fi and cellular model.
The general consensus is that this Spring’s tablet release is likely to be a new iPad Air.After all, the iPad and iPad mini were updated just a couple of months back, so it’s not likely they’ll see any changes just yet.