here's a situation for US version.
samsung was going to develope their own LTE onechip (SOC) then hold it till last march or so was hoping to ally with other japanese companies on developing LTE onechip. then that didnt happen so now they gotta develope it their own for LTE or.. use just Qualcomm's snapdragon S4 just like S3 they've used for LTE versions last year.
problem with snapdragon S4 is that many smartphone makers wants to use it for their new devices (LG, pantec etc) and TSMC cant mass produce 28mn chips enough for everyone. (ATI, Nvidia, Qualcom etc) cuz of low yeild issue, probably until 4Q this year.
their option is.. using exynos+ seperate LTE chip just like they did with GNex, or wait for Snapdragon S4 like they did with SGSII skyrocket, or wait till they develope their own LTE onechip (exynos with LTE chip)