Samsung is preparing to announce the Galaxy S II for Sprint, T-Mobile and AT&T during a press event on Tuesday and one day ahead of the announcement, official images for Sprint’s model have been leaked. We exclusively reported earlier this month that Sprint will dub its device the “Epic Touch 4G,” and it will pack a dual-core processor, a Super AMOLED Plus display, a forward-facing camera for video chats, an 8-megapixel camera capable of shooting HD video and more. We’re digging the textured back of the Epic Tough 4G and it appears Samsung was able to keep the phone just as thin as its European counterpart despite packing in a 4G WiMAX radio. We’ll be live reporting from Samsung’s press conference at 6:00 p.m. EST tomorrow, so stay tuned for more details.