I know what you mean, but it's like Google Maps, Google don't announce and release a new version of maps, it just gets added/updated?
I seriously hope Apple doesn't wait to release a new 'version' each time with say 5000 changes, but this is the company that still won't put their own apps in their own app store so only updates them once a year if we're lucky...and takes their own website down for the day etc!