Both Verizon and AT&T are rolling out LTE. T-Mobile and Sprint will eventually embrace LTE at some point later too.
But if you were hoping this would mean LTE phones from AT&T could be used on Verizon and vice-versa. Seems the answer is no. Because there is still the issue of the carriers using different frequencies within the spectrum. So much for utopia.
http://www.bgr.com/2011/07/15/verizon-says-its-4g-phones-wont-be-compatible-with-atts-lte-network/


