I've been following this fairly closely. But I don't know how I feel about the argument that it's network-related. If it is, why do they continue to sell the Thunderbolt? If I was Samsung, I would be pretty ticked that if a customer walks into VZW right now their only 4G option is the Thunderbolt.
What bothers me the most is that NO ONE is being given a direct answer. I think it's pretty disrespectful to your customers to just sit on your hands and not, at the least, just send out a press release about the delay.
I myself picked up a Thunderbolt and have had some issues with it, mainly around the radio. After all I've done, I still only get 1x data when 3G is easily available (e.g., on my friend's Droid Incredible). My 14-day return window is almost up so I may have to return it and just sit on my hands until the Charge is actually released to weigh my options.