Apple has apparently begun rolling out a two-step verification system to its iCloud web portal this afternoon. The new system adds an additional layer of security to an area that offers access to web versions of stock Mac and iOS apps like Mail, Contacts and Calendar.
It's not clear if Apple is simply testing the feature with some users or plans to eventually roll it out to all iCloud.com subscribers, but it seems not everyone has access to it yet. Those who do see it, though, say it requires users to enter a special code to access their apps...