Seems like RAM memory management might have been improved. This would certainly be a good step toward further upgrades progressing towards a possible paftal implementation of BB10.
The previous upgrade caused my Playbook to freeze a lot for several seconds at a time. So far, this is no longer happening. Everything seems to work (tried many apps, WiFi, etc) ...and no data deletions found.
Includes the following updates for all models of the BlackBerry PlayBook (Wi-Fi only and 4G/4G LTE™)
Adobe Flash Player security updates to ensure customers remain protected from these issues
Resolves issues where some users were unable to either purchase or upgrade apps within the BlackBerry World™ storefront
Updates for the 4G/4G LTE PlayBook are subject to carrier availability."