The SKUs provided by 9 to 5 Mac show two price points: $799 and $929 – possibly the cost of the Wi-Fi-only and LTE versions.
There are other explanations, of course, as Mark Gurman of 9 to 5 Mac points out. For instance, Apple could be "adding a new fourth-generation iPad SKU that is specific to government agencies, retail, or for other internal uses (this is something Apple has done before with other product lines). It is also possible that this model includes a feature (or features) other than 128GB of storage."
A tantalizing idea, that last one.
Predictably, Apple isn't commenting on the rumors and no launch events are scheduled.
Over at ZDNet, Adrian Kingsley-Hughes doesn't doubt that Apple will, at some point, release an "Ultimate iPad." But he's extremely skeptical that the device will ship anytime soon.