Ah, the HTC ThunderBolt; Verizon's first 4G LTE smartphone. It seems like it came out almost a lifetime ago, yet in reality is was just last summer. Since its release, it has received several software updates, and is expected to be blessed with Ice Cream Sandwich - but not yet.
The newest update for the device (version 2.11.605.19 710RD) should be rolling out at any time, but looks to be just a routine maintenance release. This 61MB update fixes issues with data connectivity, Yahoo! Mail, and Mobile Hotspot, supports Cisco Any with VPN, and is now enabled with the Wireless Alerting System.
We hope the next update for the HTC ThunderBolt will include Ice Cream Sandwich.
source: Verizon Wireless