Next version of iOS with overhauled notifications, lock screen, Messages, Apple Music, and much more.
Apple Details Ongoing MobileMe Upgrades
Since server-side updates are a bit more innocuous than a standard software update to Mac OS X or Microsoft Windows, it's easy not to notice that updates are occurring. Usually the only hint of these updates is that things just "work better"Apple uncharacteristically details a number of changes which include many performance issues and bug fixes to all services.
MobileMe is the online mail, calender, contact and sync services available to Mac or PC users. MobileMe's initial rollout in July was marred by poor performance, downtime and some data loss.