In their press release about the new BlackBerry Torch today, RIM also briefly announced some of the previous BlackBerry handsets that are expected to receive the update "in the months ahead":

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.

 For full details on all the new features and enhancements in BlackBerry 6, click here.