The One Laptop Per Child (OLPC) project has torn up its roadmap and announced plans to deliver a new ultra-thin computer that it promises will finally break the $100 price barrier, reports PC Pro. Gone is the dual-screen XO 2 computer, which was scheduled for release in 2010. The twin-touchscreen device folded like a book, but never got any further than the prototype stage. In its place comes the ridiculously slender XO 3, which is described as a “single sheet of flexible plastic” that “will be unbreakable and without holes in it.” Photos of the device show it being used as a conventional laptop, satellite navigation device, camera, and games machine. Although details are very sketchy and the released photos are nothing more than mock-ups, OLPC claims the device will be launched in 2012 and will have a target price “well below” $100. OLPC has a history of over-optimism, however. Its original XO laptop was meant to be sold for $100, but failure to land the bulk orders required to push down the price resulted in the laptop being sold for closer to $200…