Apple’s next-generation iPad tablet will go on sale in initial launch markets on March 16th according to a new report. Citing an unnamed “Apple Store source,” Apple watcher 9to5Mac claims that preparations are being made for an event within Apple Stores that is scheduled to take place on the 16th. Given the timing, it seems likely that such an event would focus on Apple’s iPad 3 â€” or iPad HD, as it may be called. Apple Stores will reportedly host a separate event some time after the 16th, but details surrounding this possible additional product launch were not made available. Apple is expected to take the wraps off its next-generation iPad on Wednesday and it is widely expected to feature a new high-resolution display, embedded 4G LTE, a new quad-core Apple A6 processor and a slightly redesigned case.