Update: HP has contacted me with its official press release for the U.S. The Slate 21 will start selling in the States in September, starting at $399. It includes 8GB of storage and an SD card slot for additional capacity.
While PC makers have released a few all-in-one desktops that double as tabletop tablets, HP is doing things differently with the forthcoming Slate 21, which it just unveiled at an event in Beijing. Systems like the Lenovo Horizon and Sony Vaio Tap 20, as well as HP's own Envy Rove 20, can lay flat to be used like a tablet, but still run Windows 8 and use traditional x86 chips.
The Slate 21, on the other hand, will run Android (version 4.2.2, to be exact) and is powered by Nvidia's Tegra 4 ARM processor. In addition, it's not designed to lay completely flat — its kickstand lets it sit at a 30-degree angle for tablet usage or upright to be used in the more traditional desktop mode. (Update: According to HP, the hinge lets you adjust the angle of the display from between 15 to 75 degrees.) The 21.5-inch display is obviously touchscreen-enabled and features full 1080p resolution.
As is often the case with these announcements, HP provided no price or availability for the Slate 21, saying these details will be revealed when it's released in each country. What price would entice you to buy the Slate 21, or would you have no interest in this Android all-in-one PC no matter the cost? Let us know in the Talkback section below.