Seems that way. My pb was stuck on reset so i connected it to my desktop and it said it needed a software upgrade and that was the one it gave me. Fixed my reset sticking but erased everything i had done up until then. Luckily it wasn't much and nothing important.
On the OTA update screen (when an update is available) on your playbook there is a section saying what's new in this update. But I think last one I saw said something like "enhancements to the OS" lol so not much help there.
Posted from my CrackBerry at wapforums.crackberry.com
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