It is worth nothing that while LTE is still in development Sprint and Clearwire have already deployed 4G services that are operational and covering 30 million people in the US. Wimax is deployed in around 145 countries worldwide. Sprint will have a 4G device in 2Q or 3Q this year, and will likely have 120 million people covered by 4G before LTE is even deployed here.
But the 4g sprint's rolling out is only 10 mb/s while the 4g verizon will be rolling out will be up to 100 mb/s.
If you're not careful, you're going to catch something.