i think that Apple should be worried about webOS: is sleek and easy to use interface open standards. Is a no-brainer that the mind behind webOS was an ex-Apple engineer, a good one. notifications are just one aspect of this OS that is cool.
I think also that Apple just cares about the business now (even with iCloud free), closing the business to itself and its developers so, don't expect to see many inovations directed to the plataform ease-to-use, expect inovations that are directly related with the business rules: even if those inovations are APIs for developers, remember that devs are giving away 30% of their sales to Apple.