After some leaks at their international stores, on Wednesday evening Amazon announced new ereaders and tablets, all set to ship in October. The new basic Kindle is thinner, adds a touchscreen, and sells for $79, with ads. (That’s $10 more than the previous basic model, or 15 percent higher. So the people who fight to control pricing because “e-books can and should be less expensive” are charging more for their least expensive device to read those ebooks.) The newest addition, tipped earlier, is the Kindle Voyage, “the thinnest device we’ve ever built” (7.6 mm thick), weighing 6.4 ounces, with a high-resolution display (300 pixels per inch) and improved front […]