This device, before being called the Thunderbolt/Mecha/Incredible HD, was leaked as the HTC Scorpion (after the rumored processor) back in August/September, so that makes sense.I don't know 100% sure but a couple of my hardcore tech friends say it is the fabled scorpion processor, which originally was the first 1.2GHZ processor from qualcomm the FIRST to have LTE/3G support on one chip with the integrated Adreno GPU.
its still possible this could be another version of it thats only able to handle 1ghz
Inspire 4G i saw was overclocked to 1.8ghz (stable)
However, according to the table in the Wikipedia page, all the various Snapdragons have been Scorpions. The T-Bolt processor also seems no different than that in the Inspire/myTouch 4G except the radio.
http://en.wikipedia.org/wiki/Snapdragon_(System_on_Chip)
Not necessarily a bad thing because those processors are very powerful. Like you said, 1.8 GHz OC on the Inspire - that's insane.