Here's a picture of an internal AT&T document. But, oh no, it says "AT&T Mobile Hotspot for iPhone 4 on up to 3 devices!" 3 devices? I've never seen a gadget that supports mobile hotspotting with any limit under 5 gadgets. Even the Verizon iPhone 4 will hotspot five devices!
Update: Only 3 Wi-Fi devices can be tethered through the MiFi connection. You can tether 5 devices if you'd like, but two will need to use Bluetooth or a USB connection. The Verizon iPhone could be the same.
