Most jailbreakers just want to customize their phone(themes, more functionality) and therefor accept higher security risk, but those users also are often more advanced and more careful.
It looks an awful lot like the back of the Desire HD, but HTC is well known for repeating design themes across its phone portfolio, so let's not jump to any conclusions just yet.
Just to name a few: enhanced security, phone finder, Chinese voice assistant (apparently with 85 percent comprehension accuracy), more interactive themes and 5GB of cloud storage service with online client.