According to the latest details in the non-launch of the HTC Thunderbolt, the handset has now been delayed due to issues with battery life.
As “people familiar with the matter" noted, the battery life is so bad that it is even difficult to test the phone.
It sounds like there are some updates being made to the
firmware and the Thunderbolt is still
being worked on for an upcoming release. But no one seems to have any idea when that time may come.