I guess it would be
iPhone 5 - Sprint exclusivity in the US over the holiday period, possibly a 4G device. The problem Apple may be facing is that US carriers call all sorts of things 4G, on ATT is HSPA+ and LTE, on Sprint its WiMax (or LTE), on Verizon its purely LTE. In this scenario ATT and Sprint would market the iP5 as "4G", while Verizon could not, unless it supports LTE.
The iPhone 5 would likely launch in the rest of the world as a HSPA+ GSM device. Although there may be exclusives on the device, or colour variants by market. e.g. 3-UK often has exclusives on white handsets.
iPhone 4S - brings many of the features of iOS5 to the iPhone4 form factor. Available as a "world mode" phone, GSM and CDMA. Freely available on carrier of choice.
iPhone 4 8GB