Kindle DX was taken apart by RapidRepair.com recently. Kindle Zen took a closer look at these photos and suggested that Kindle DX’s PCB is wired for WiFi chipset and antennae. It’s quite possible that Amazon would sell WiFi Kindles in countries where it will not be able to reach an agreement with wireless operators. In the past Jesse Vincent speculated about possibility of 9.7″ Kindle based on Kindle source code and was right.
I wouldn’t hold my breath any time soon about WiFi in US version of Kindle because that would be a completely new device and Amazon has already released two during last three months. This caused some anger among Kindle 2 users who felt that their devices almost immediately became outdated when Kindle DX was released.