Today, you can officially purchase the HTC Thunderbolt, and late yesterday, Verizon issued their press release making sure we knew. Contrary to Verizon's previously stated stance that they will eventually do away with unlimited data plans, they are offering exactly that with the new HTC Thunderbolt. For $29.99 per month you can get an unlimited 4G LTE data plan when you purchase the TBolt on contract. This is especially enticing since the TBolt can be used as its own mobile WiFi hotspot. Their own USB 4G home internet modems seem obsolete in comparison, since their plans are about $80 bucks a month for only a 10GB data plan. The TBolt suddenly becomes your more affordable home internet for some users.
It's doubtful that you will be able to "grandfather" this unlimited 4G plan in the future since Verizon still plans on getting rid of that, but we don't know for sure. Below is a link to the full press release.
Source: Verizon - HTC Thunderbolt Full Press Release