When Sprint launches their WiMax service in Chicago and DC sometime in early 2008, users should see speeds somewhere around 2-4Mbps for an estimated $55, company executives guessed recently. What's more, it looks like the company will be embracing an open access model -- as in they will treat the connections like home broadband lines. They won't limit your content options with the walled gardens and other restrictions you see with some cellular carriers. There's some hemming and hawing here. Sprint apparently hasn't decided whether to start with an open network or open the network up gradually.