Sprint is making the case for an iPad 4G -- literally, in leather with pockets for both an iPad Wi-Fi and an Overdrive (think MiFi but with WiMax speed).
The 4G Case has a pocket to house an Overdrive3G/4G Mobile Hotspot, so you can simultaneously connect your iPad™ and four more Wi-Fi enabled devices at 4G speeds anywhere within 4G coverage areas. Meaning now you can use your iPad™ for everything it was built for, and then some.
You can hook up to 5 devices to the Overdrive, and Sprint's already suggested your iPhone be one of them. That leaves room for an iPod touch... and we guess your friends' iPhone and iPad as well!