I think we'll have to wait and see, but my guess is, this is only about Exchange connectivity right now. There was a recent rumor that Lotus Notes capabilities are being developed for the iPhone too -- but that might wind up being sold as a 3rd. party add-on, supplied by IBM?
So far, "average consumers" lacking a Notes or Exchange server have only been able to do the "push" email, contacts, etc. with the help of a "middle man" cellular service (like Verizon offers for an additional monthly charge with the Motorola Q phone) - where basically, your PC hands off your data to Verizon, and they act like the missing Exchange server, pushing things on over to the smartphone. Either that, or the RIM/Blackberry's method where you use their desktop client to push the info over the Internet to your phone (again requiring you leave your mail program open and running on your desktop computer, so their client can "echo" the info out to your phone).