"We understand that there is great interest in tethering but cannot provide any details at this time. We know that iPhone users love their devices and mobile broadband, and that they're likely to embrace tethering just as they have other features and apps - by using it a lot. iPhone tethering has the potential to exponentially increase traffic, and we need to ensure that we're able to deliver excellent performance for the feature - over and above the increases in data traffic we're already seeing - before we will offer the feature."
Coincidentally, that's almost identical to a statement the company issued last September, but regardless, AT&T can't necessarily afford to meet its network "performance objectives" before acting -- Verizon's announcementthat Palm's Mobile Hotspot app would become a free add-on with the Pre Plus and Pixi Plus was a serious shot across the bow of any other American carrier trying to woo business customers and road warriors. Think it'll go live before the next iPhone does?