A rumor over at 9 to 5 Mac says that iPhone will ship with two previously-unannounced features when it ships next week: a VPN client:
The iPhones will have the standard OSX VPN client when they ship next week. This will allow connecting to Macintosh and Windows VPN Servers on L2TP or PPTP over IPSEC. The client is very simple and will be set up from its own settings pane.
The iPhone utilizes Leopard's Quick Look functionality to view Microsoft Word and Excel Files. Once viewing the files, you cannot edit them, however, unless you use Google Docs and Spreadsheets through the Safari Browser.