There's been a lot of talk about white iPhone 4's finally (as in, 10 months after the black iPhone 4 began shipping, finally) making it to market. There are reports of some units appearing in the UK under Vodafone and now a grainy photo from M.I.C Gadget shows a white iPhone 4 with a larger screen. Another image from the same source shows both screen bezels side by side. Could be the real thing or a hastily cobbled-together Photoshop job but until we see an actual white iPhone 4 in stores, expect a lot more speculation on whether Apple will simply give us a colour refresh or release a new model with incremental feature upgrades or availability to new mobile carriers.
Sources: M.I.C. Gadget