Microsoft was reportedly showing off an upcoming quad-core Windows slate last week during the company's TechEd New Zealand conference.

Two photos of the device were posted online by self-described Microsoft fanboy and IT consultant Alan Burchill, from a session with Microsoft Principal Architect Patrick Hevesi.

Burchill's post originally said the tablet would be distributed to attendees at an "upcoming Microsoft event," but those claims have since been pulled from the post with no explanation as to why, according to ZDNet's Mary Jo Foley. Microsoft's BUILD conference is scheduled to begin in about two weeks, on September 13.

Tablet of mystery

Specs were not released for the mystery quad-core device, and the photos shed little light on what the device might be like. Burchill's images show what appears to be a thin tablet with two switches on one side. It's unclear who the manufacturer of the purported quad-core slate is, or which processor it uses.

During a video interview prior to his session at the conference, Hevesi added a few details about upcoming quad-core Windows one panel tablets. One slate he mentioned but didn't show in the video, which may be the one Hevesi later showed off, was said to be ultrathin and look very much like an iPad 2 with a 1080p HD screen, eight hours of battery life and a Windows 7 interface. It's not clear when the tablet might be released.

Microsoft may be backtracking on Hevesi's slate sneak peak after news media picked up on the news. The video with Hevesi has since disappeared from Microsoft's TechEd New Zealand site, but a Google cache verifies that it had been there. You can still watch Hevesi's interview online here, at least for the time being.

It's not clear why Microsoft would pull the video from its TechEd New Zealand site. It may be a technical glitch or perhaps Microsoft's tablet sneak peek ran afoul of a non-disclosure agreement. Microsoft has been asked to comment.

Quad-core tablet explosion

Quad-core tablets are expected to be all the rage in the coming months. Nvidia said in May that it expects to see Android tablets using its quad-core ARM-based Kal-El chips by September.

Qualcomm and Texas Instruments are also making quad-core ARM chips for tablets, Texas Instruments in June announced the OMAP4470 for tablets designed to work with Windows 8.

But don't expect any of those chips to be built into the mystery Windows 7 quad-core device Microsoft was showing off. Windows 7 currently works only with Intel's x86 chip architecture and not ARM, that will change in Windows 8 when Microsoft releases its next OS for x86 and ARM chips.