Hot Hardware published a review on the Hands On With Lenovo's New X1 Carbon and ThinkVision 28 Smart Display with Next-Gen NVIDIA Tegra

A quote from the article:

...The ThinkVision 28, which is priced at $999, is a unique product since it operates as both a monitor and an AIO system. This 28-inch panel also sports a 4K resolution as well as 10-point multitouch. As you can see in the video, there are multiple USB ports, three HDMI ports, a microSD slot, DisplayPort, Ethernet port, and more on the base. When disconnected from a PC, however, the monitor functions as an Android-based AIO system running Android 4.4 on a "next-gen NVIDIA Tegra" SoC, aka Tegra K1, though Lenovo won't confirm that.

While at Lenovo's suite, we also had a chance to see the new Miix tablets, 11-inch Yoga 2, Flex 14D and 15D, and the hot new ThinkPad X1 Carbon that has been updated with Haswell, a thinner, sleaker design and a top row of remappable function buttons.

 Hands On With Lenovo's New X1 Carbon and ThinkVision 28 Smart Display with Next-Gen NVIDIA Tegra @ HotHardware