Last I looked, iCloud was not HIPAA¹-compliant. Health-care workers who previously could have iCloud enabled, as long as they did not use it for HIPAA-covered documents, may be in for a big and expensive surprise. ¹ http://www.hhs.gov/ocr/privacy/hipaa/understanding/
(Not a lawyer, but I have to care about this, for professional reasons.)
[+] Say, emailing in the clear about PHI. This is extraordinarily common even among people who theoretically know better.