Apple just announced on stage at WWDC iCloud Drive, its cloud storage syncing system that sounds sneakily similar to Dropbox.
iCloud Drive syncs your stuff across all your devices, and across all platforms—even Windows. Documents are now accessible from the Finder and syncing is automatic. Which means, iCloud is better. And that's a good thing. Although, the main takeaway here is that iCloud is sort of mimicking what Dropbox and Google Drive and whatnot already do automatically.
Also worth mentioning is Mail Drop, which sends large files through iCloud instead of getting bounced back, up to 5GB. Pretty useful stuff.
Photos are also benefitting from this iCloud refresh. Now all of your photos will be available on all of your devices. Search is improved too, based on location, time, albums, and so forth. iCloud Drive also syncs the edits on you photos. Crop a photo on your iPad and hit save, and the edited pic will show up on your iPhone. Synergy!
Finally, you can't talk about iCloud without also talking about pricing. The first 5GB is still free, followed by 20GB for a dollar a month, 200GB for $4 a month, with tiers going up to 1TB.