Looks like we've got another mystery model number to keep track of. A user agent profile (UAProf) belonging to a device with the model number SGH-I337 has been discovered on Samsung's website, and while there aren't many details about the product in the page, the "Screen Size" entry does list the mystery hardware as having a display with a resolution of 1920x1080. There's also a "Keyboard" entry that says Phone Keypad, which is also what the UAProf for the AT&T Galaxy Note II SGH-I317 says, suggesting that the SGH-I337 is also a touchscreen product.
As I just mentioned, the AT&T Galaxy Note II's model number is SGH-I317, and just about all of Samsung's other smartphones for AT&T also feature model numbers that are SGH-I__7. That suggests that this SGH-I337 device is AT&T-bound. With recent rumors that Samsung may be planning to include a 4.99-inch 1080p display in the Galaxy S IV, some have suggested that this SGH-I337 could be AT&T's version of the next Galaxy S flagship. That's certainly possible, but it's worth noting that there's nothing in the document that calls this out as a Galaxy device, so for now the true identity of the I337 is still up in the air. Stay tuned and we'll bring you more details on the Samsung SGH-I337 as we get 'em.