We did, however, learn that the iPad runs iPhone OS 3.2, and learned a lot about the features that the iPad (if not iPhone OS 3.2) has. The iPad has a number of nifty new capabilities that may or may not make their way to the iPhone. Apple did not sort them out for us. iTunes on the iPad, for example, appears to be richer than the iPod software on the iPhone. Will the iPhone OS 3.2 software upgrade the existing iPod player on the iPhone itself? Who knows.
I suppose the most important thing to consider now is that Apple has timed major iPhone upgrades for the June and/or July months. June, as we know, is when Apple's WWDC is typically held, and is where Apple announced the iPhone 3GS last year. Now that the iPad event has come and gone, I'd be surprised if we see a major OS upgrade for the iPhone before summer.
By then, Apple had better have new iPhone hardware, too.