It seems you're making the keychain stronger with updates to 1Password. However, it would be great for users if you explained exactly what steps we need to take to utilize the new updates, and exactly how to execute those steps. My understanding is, without taking some actions with our keychains, the increased security to 1Password doesn't benefit existing users at all.
I'd suggest you proactively push these steps out to your users, and suggest they take the steps (especially considering many of us sync using Dropbox, and want all our passwords and VITAL information about our identities to be as safe as possible on a not 100% secure cloud space). Otherwise, it feels like you're not really helping your existing customer base take advantage of the security improvements.
My longterm security worry is, someone gets ahold of my keychain today, and in the future (5 years? 10?), when computers and attack methods have become much more powerful, a "bad guy" will be able break into my keychain, and learn everything they need to steal my identity. Even if I've changed my passwords, so much other vital information is a keychain, it's a thought that truly concerns me. Hence, I really think every 1Password user should be alerted, and carefully instructed on how to maximize their protection. Otherwise, I think your updates are wasted on the majority of your users.