Talk of a Nokia Lumia 910 with upgraded hardware may have gained support after Dutch retailer Typhone put up a listing for the device. Its definition would mostly match that of rumors, giving it a 12-megapixel camera while keeping the 4.3-inch screen, 1.4GHz Snapdragon, and front camera of the Lumia 900. Instead of AT&T's LTE-based 4G, the Windows Phone would upgrade slightly from the 800 with 21Mbps HSPA+ 3G.
The listing doesn't give a clue as to the release date, but Nokia is making its return to Mobile World Congress and could show the 910 at the Barcelona event. It might arrive in the spring if it's shown in late February, lining up with mentions of a May or June release.
Whether or not it's accurate isn't certain. Retailers are known to occasionally post speculative entries based on rumors in order to attract buyers. Occasionally, they do receive advance information and may spoil company plans.