The Samsung GT-i9506 has already been launched in Korea; this is the version of the Samsung Galaxy S4 with a Qualcomm Snapdrsgon 800 under the hood and LTE-A connectivity. Now, this variant of Samsung's Android flagship model has visited the FCC. Because the FCC only concerns itself with the phone as it deals with U.S. communications standards, we know that LTE band 5 (850MHz) is enabled on the device...
Source: http://www.phonearena.com/news/International-version-of-the-Samsung-Galaxy-S4-with-LTE-A-and-Snapdragon-800-visits-the-FCC_id46502
Source: http://www.phonearena.com/news/International-version-of-the-Samsung-Galaxy-S4-with-LTE-A-and-Snapdragon-800-visits-the-FCC_id46502