RIM officially revealed the BlackBerry Bold 9900 earlier this year during its annual BlackBerry World tradeshow and now it appears carriers are finally preparing to launch the phone. PhoneArena has obtained a leaked internal T-Mobile screenshot that suggests the phone will become available on August 31st. It also mentions that there will be a $50 mail-in rebate but does not confirm the subsidized price of the Bold 9900. BlackBerry fans will appreciate the device’s thinner design, more powerful hardware, and revamped BlackBerry 7 operating system, but this device doesn’t stray far from those that came before it. We expect we’ll hear more of a confirmation on its official launch date in the coming weeks.