Amazon mistakenly listed an Acer W3-810 which just so happens to be a non-existent Windows 8 tablet with an 8.1-inch 1280x800 display listed at $380 Bucks. The Verge reports that the 1.1 pound tablet listing included a 1.8GHz dual-core Intel Atom Z2760 (a Clover Trail chip, rather than an upgraded Clover Trail+ or Bay Trail model), 2GB of RAM, and 32GB of storage, as well as 2MP rear- and front-facing cameras and micro USB and micro HDMI ports. Most of these specs are roughly identical to what we saw in Acer's 10.1-inch Iconia W510, so the W3 should suffice for most basic Metro and desktop apps as long as you're not doing work that requires a fast graphics processor.
The price and any of these specs could very well change before the official release (in the event that this device is actually released at all). The specs and photos do appear to be plausible, though, and with the success of small tablets like the iPad mini, Nexus 7, and Kindle Fire, it comes as no surprise that Acer (and, by extension, Microsoft) wants to get into the game.