According to the latest info, courtesy once again of the notorious @evleaks, Samsung codenamed Huron will be called ATIV SE. Since Verizon is already offering the first ATIV, we guess the SE might be short for Second Edition.
Anyway, Samsung ATIV SE is rumored to pack either a 4.3" 720p or a 5" 1080p display. It should be running on a quad-core Snapdragon processor with 2GB RAM and a 13MP camera.
As the latest rumor has it the ATIV SE will come with the latest available Windows Phone 8.1 OS. This means it will most probably launch in April or later, after the Microsoft's BUILD conference where the WP 8.1 is going to premiere.