I haven't had time to really test the unit, but it has some intriguing, indeed unique things about it, which is rare for a tablet these days. Most notably, it has an 18-hour battery life, which is remarkable. (To be clear, that number is under ideal conditions.) And with a microUSB plug, this long-life battery can be used to charge other devices, notably your cell phone, so you don't necessarily have to carry an extra battery pack. Also, unlike other tablets, this one isn't completely flat -- it has a sort of rounded "handle" on the side. This makes for a better, more comfortable grasp, and it also can fold down to a tilt stand position for typing, or as a full stand for watching movies.
(I'm not 100% sold on it. It does make it easier to hold the tablet, though it adds some weight -- in fairness, I believe that's where the batteries are installed that allow the long-life. But it also means its back won't lay down perfectly flat. It's not problematic at all, though, and some people may love the benefits of it. Most especially if it's what allows the 18 hours of battery life.)
The specs are good, not great. It has 1 GB RAM and 16 GB capacity. It doesn't have the highest resolution, nor is it the most powerful, but the display is very crisp, and the unit is perfectly responsive. It comes in both 8" and 10" models.
What I'm also intrigued by is an accessory that is available for the 10" tablet: a bluetooth keyboard which doubles as a screen cover. It retails for $70. I haven't had a chance to test this though, so I don't have any reaction to how well it works.
For those who keep tabs on such things (no pun intended), the event was hosted by Ashton Kutcher, who in an amusing video explained that he wasn't just a spokesman, but was hired by Lenovo as a project engineer, complete with name tag and cubicle.