iCloud was a major component of OS X Lion, and it is going to be a bigger part of Mountain Lion.
Two features are being touted so far.
- Easier setup by tying directly into your iCloud account to pull down more settings than before. No idea what is exactly going to be pulled down yet.
- Documents in the Cloud is getting expanded, which will hopefully take care of the huge glaring hole in iCloud.
I’ve heard rumblings of tab-syncing in Safari and who knows what else is going to be coming. Of course, the new Reminders, Notes, and Messages apps tie in as well, which will expand its use on the Mac.
iCloud is touted as the central strategy for Apple for the next decade and Mountain Lion seems to be enforcing that idea.