It looks like those rumors of a late iPhone 5 launch weren't true after all. Most delay speculation has focused around the recent earthquakes, and their disruption of supply lines across the industry. But during yesterday's Q2 earnings call, COO Tim Cook stated that Apple's component supply had not been jeopardized and that the company expected no "material" harm from the quake.
Which, at the very least, should put to rest rumors of a disaster-caused delay. If the iPhone 5 is late, it won't be due to supply issues.
But it might still wait until September to launch. If Apple wants to launch the new iPhone at their next Fall iPod event, to coincide with a new media streaming service, the timing for this rumor still works out.
We've also heard rumors that Apple intends for the next iPhone 5 to be a world-mode GSM/CDMA phone. Since these rumors come from...the Verizon earnings call, there's reason to pay them heed. And it IS possible that acquiring the necessary supply of Qualcomm dual-mode chips has slowed the launch.
I suspect we won't see any delay at all, though. Every year, the new iPhone's launch is preceded by a flurry of preposterous rumors. This year they've all been about a delay. The hive mind has settled on 'September', but other dates have been bandied about. Some have even put the iPhone 5 launch in 2012. I've been suspicious of this line of speculation for a while now. At this point, I fully expect to see a new iPhone in June.
If it doesn't launch, Apple has something weird planned.