Apparent errors in the article:
1. Logitech's Unifying technology has nothing to do with Bluetooth. It is not interoperable with any Bluetooth devices. It simply allows up to six compatible Unifying devices to connect via a single tiny USB dongle. From the Logitech statement quoted in the article, it appears this mouse is Bluetooth with some ability to simultaneously register and quickly switch between multiple Bluetooth-enabled PCs or tablets.
2. The mouse shown in this article is clearly thicker under the palm of the hand and thinner at the fingertips. The article currently reads "sporting a ramped form factor that's thinner at the palm end and thicker under the fingertips."