We're not currently aware of a 3G Nook Color. The B&N letter to the FCC clearly indicated that 3G was "permanently disabled." We can confirm this from the NC tear-down photos where there is a 3G modem pad on the motherboard, but the modem chip is absent.
I would guess that the issues that surface when adding this feature aren't really hindered by the hardware, but rather, from a business perspective, how to handle data plans and the costs associated with the amount of data that a tablet can push. Basically, it's the same situation that has pushed pretty much every other 3G [tablet] data plan to kill their "unlimited" data option.
I picked up a Virgin Mobile 3G hotspot at Walmart, and immediately signed up for their $40/month "unlimited" data service, only to receive an email 3 days later that this service has now been terminated, and replaced by a 5 gig/month limit. This was very disappointed for them to change the rules mid-game, but it appears that every other data plan provider has done the same thing.
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