There are a few 2048x1536 monitors. But that's not the only line of evidence the article's conclusions hinge on. There's also the OS, the version, and the source of the connections from apple's corporate IP block. Given all that, and given what we already know about the iPad 3 (it will have a higher resolution display) Occam's razor leads to the conclusion that these are pre-release iPad 3 devices. The 2nd most likely conclusion is that this is an intentional hoax on the part of someone within Apple, which is hardly a more credible idea.