Interesting discussion about this issue on StackExchange:
http://apple.stackexchange.com/quest...ps-with-icloud
Browsing
Apple's own dev page on iCloud, it seems pretty odd how iWork is currently working-syncing should be doable without the iCloud.com intermediate step (thru the sync-able folders on your computer that Lion supposedly provides)
What is confusing I think is that Apple claimed a little while back that iWork *had* been updated for Lion, but apparently the actual iCloud integrated update is still in the future.
And why I can understand they can't have everything done in time (they launched so many different new software products two weeks ago), it seems really odd to train people to use this interim method of saving, if they have a better solution coming soon.
I haven't heard of any 3rd party apps that are doing iCloud seamless syncing either yet (although those dev notes I linked to are for them).