Microsoft (MSFT) is trying to build some Apple (AAPL)-style mystery and excitement for its next product launch, possibly a tablet to take on Apple's popular iPad. Media outlets are speculating that Microsoft on Monday will debut tablets running its new Windows RT operating system, a variant of the upcoming Windows 8, on low-power ARM (ARMH) -based processors. It will break with its history of using Intel (INTC)-based processors. Microsoft could