The day has finally come. After 2 1/2 hours in the reserved line, I was able to walk out with the iPhone 4 up and running, albeit without contacts, music, videos or my app collection.
Getting it home and synced was uneventful. iTunes detected the new phone and dutifully restored everything. A couple of reminders, however: First, some passwords won't survive the sync. I had to sign on to Pandora again, enter my email passwords once more, and tell my Navigon app that I did indeed purchase traffic and panorama view maps. Tapping their icons re-loaded them, but the panorama maps don't display properly just yet, while the regular 2D and 3D maps work just fine. Hopefully this will be part of a Navigon update that includes multitasking. Oh, and your Bluetooth devices will have to be re-paired as well.
Speed increases are pretty obvious and very welcome. I could easily discern the extra speed in bringing up web pages, long playlists and even the address book.