Do these new photos mean new vulnerabilities?
It is really hard to say. We don't know yet when they were hacked. After all, they could have been taken at the same time and then revealed later, to continue the story. We also don't know if the new photos are real.
Of course, we do know that many of the photos earlier this month were confirmed as real by the actresses themselves. So we already know there is a very real threat out there and its dangers run much deeper than embarrassing A-listers.
For now, while iCloud is encrypted and secure, be aware of email phishing scams targeting your password and be sure to use Apple's two-step verification. However, those with Apple's new iOS 8 may have less to worry about, if they do not upload their photos to iCloud.