This was certainly a surprise in he keynote..
I do wonder how thy will manage this as it makes the desktop apps rather redundant for mac. More interesting that now pc will now experience iWork which could break office's monopoly if this s done right and marketed!
Watch this space!
I don't think that'll happen. Google Docs has a much better chance of doing that and even that is not likely to happen. Pretty hard to kill what has become an industry standard on just about every computer out there including Macs.