Thank you for your post. We are working very hard on rolling out our LTE network in the same footprint as 3G. New Jersey is on the list of upcoming cites and should be launched soon. Although we don't have an exact date you can stay updated at http://Sprint.com/LTE.
You may also check out: http://s4gru.com/ - However please note this site is not officially endorsed by Sprint but does give some further information.
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