[simosx]

Your Ubuntu will be automatically updated to 16.04.2 when the next package update kicks in. You probably had some updates around Tuesday which upgraded you to status "16.04.2" (run "lsb_release -a" in a terminal to verify). Yesterday it was only the ISO images that were released.

The important issue with 16.04.2 is that you can now decide easily upgrade the Linux kernel from the original 4.4 version, to the new 4.8 version. This 4.8 Linux kernel version was released in Ubuntu 16.10 (Oct 2016) and it has been promoted to the new kernel for 16.04.2.

May sound complex :-). There is a nice graphic in https://wiki.ubuntu.com/Kernel/LTSEnablementStack that explains it well.