A German manufacture called "WeTab" (formerly known as the WePad, remember :D), they've redesigned that Tablet PC to run nothing but GNU/Linux. Finally, a true Linux Tablet PC!.
It won't come with Unity pre-installed but comes with an operating system called WeTab OS which is actually a derivative of the MeeGo OS (a Linux platform especially designed for mobile devices, funded by Intel and other big names in the industry).
It's not available world wide (only available around Europe at this stage, it seems), but from WeTab home page you can get additional information about its availability.
Main hardware specifications...
*. 11.6 inch, 1366-by-768-pixel resolution touch sensitive screen.
*. Comes with an Intel 1.66 Atom PineView processor.
*. 1GB of RAM.
*. Pre-installed 16/32GB of SSD drive.
*. Storage can be expanded using SDHC upto 32GB.
*. Operating system as mentioned above is the WeTab OS and has a video player, audio player, Web browser, Adobe flash player, HTML5 support, Open Office suite, eBook reader, photo manager, E-mail client, file manager, multitasking support etc... it's a complete OS.
*. 1.3 Mega Pixels of front web camera.
*. Pre-installed proprietary codec support such as MP3, WMA, AAC, WAV, OGG
H.264, AVI, MP4, DivX, WMV, OGG. Thank you :D.
*. Gorgeous looking Magnesium-Alloy body.
*. Ambient Light Sensor, Acceleration Sensor, GPS.
*. 6 Hours of battery life.
*. 2USB ports, SD slot, mini HDMI output, 3.5mm stereo jack, Sim Card slot, built in speaker and microphone.
*. Wi-Fi, Bluetooth and optional 3.5G support.
*. Also supports MS Windows OS.
*. Weight - 995g.
It also fully support Gnome/KDE and most other GNU/Linux and its "portions" which is obvious. And will we be able to run Unity?, of course!.
The price is roughly about $505 and even though it's available in Amazon but it only seems to for German citizens at the moment. It's more than capable of running HD videos easily and when considering the hardware details... it is certainly a powerful Tablet PC.
Well done WeTab, I'm loving it already :D. Even though it's been a while since they first released it, but let's hope that it'll be available for the "rest of the world" quite soon.