"Compatibility with Existing BlackBerry Smartphones
BlackBerry 6 will debut on the new BlackBerry® Torch™ smartphone (announced today) available from AT&T on August 12 and it is also designed to run on select BlackBerry smartphones already in market. Subject to carrier certifications in the months ahead, the new OS is expected to be available for the BlackBerry® Bold™ 9700, BlackBerry® Bold™ 9650 and BlackBerry® Pearl™ 3G, as well as future BlackBerry smartphones."
Os6 is only gonna be available for the torch and 9650 with its 512 memory...
The 9700 will be getting a lite version of OS6 and the Pearl 3G will also be receiving OS6... But no love for the 9550 users... Some say it has something to do with surepress... But unless the Odin refresh does not come with surepress then I don't believe that's the issue..
EDIT: Just found out that the Storm3 will NOT be surepress... So surepress is the reasoning behind OS6 on the 9550