Apple today made a quiet update to its iPod touch lineup, launching a new 16 GB fifth-generation model without a rear camera for $229. The new iPod touch, which is only available with a black front and silver back, replaces the fourth-generation iPod touch that Apple had continued to offer since the introduction of new models late last year. The new model is available now in Apple's online store and should be available in the company's retail stores starting tomorrow. Apple introduced the redesigned fifth-generation iPod touch last September with the same 4-inch display seen on the iPhone 5 and a number of other enhancements. But with the new hardware pushing the entry-level price to $299 for a 32 GB model, Apple decided to