Unlikely
As Vodafone's network runs on GPRS and requires a SIM card this would mean a total redesign of the Kindle for the non-EV-DO network.
As there is a large American market currently available to Amazon (plus some smaller networks that run EVDO around the world) I would think they will concentrate on those markets in the short to mid term.
Plus it is unlikely that GSM networks would allow a SIM card that works only for the Kindle device as they could make more by charging only for the data and allowing any data connection through the SIM.
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