Apple has released macOS High Sierra 10.13.5 which primarily adds Messages in iCloud support, but it also includes some enterprise and security updates. You can download and install it from the Mac App Store now.
Twenty years ago this month Steve Jobs introduced iMac, an revolutionary new Mac aimed specifically at easy Internet access (i for intenet). It not only redefined the design and styling of computer products but changed Apple from being a minority PC maker to the world's most valuable tech company.
No they are no the latest Bond movies! Sadly they are new security issues affecting a performance feature of modern CPUs called speculative execution.