Update: It looks like the Tango tablet is available to purchase if you signed up to be on the list to buy one at Google I/O. The rest of you will, presumably, have to wait.
It looks like Google's Project Tango AR / sensor-beast tablet is headed to the Play Store soon, packing an NVIDIA Tegra K1 processor and a boatload of sensors. Not to mention 4GB of RAM and 128GB of internal storage, for some reason.
This is a development device, though, so despite the beefy specifications, there's probably no reason to buy it unless you're super interested in developing AR / 3D experiences for Android. Or you just have the money to waste. There's no price for Tango yet, but we can probably assume it's going to be expensive - this same developer kit went for $1024 in limited quantities at Google I/O this summer. The Play Store version will, predictably, not come with any sort of warranty or refund opportunity - Google wants you to be dead certain you need this when you buy it.
Oh, and it comes in white.
You can head to the Play Store and drool at it now, or look on in slight disgust. Whatever floats your boat.