As spotted by iClarified, the new OS features update bundles for iPads under the model identifiers 4,3 and 4,6, which are yet to be officially acknowledged by the company.
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What these new model numbers mean remain to be seen, but it seems unlikely they represent brand new iPads in the traditional sense.
In the past, Apple has been known to quietly boost the hardware within existing models using, for example, slightly different processor configurations when there's a component shortage.
It's also possible those unidentified models could be bound on the China Mobile network which, as Apple Insider points out, runs a unique TD-LTE 4G network and would require their own certification.
- Hmmm, no sign of the iPhone 6...