A few weeks ago, the Android community notched another victory: HTC formally announced it would no longer be locking its bootloaders, though they hadn't really worked out all the details yet. Add another device to the "it won't be locked, we just don't know how or when" list: the HTC Sensation.
Ah, yes, the infamous alot. ಠ_ಠ
The important bit of that wall of text:
We are currently developing new bootloader unlocked software for [the Sensation]. HTC is still committed to allowing our customers to unlock the bootloaders if they wish, however we are still implementing the policy and many updates were already finalized prior to our change in policy. We apologize for the inconvenience, but be assured that we are working on a solution for our customers and our commitment has not changed. Please stay tuned to our official channels for ongoing updates on how we will be implementing this policy.
In other words: HTC already had locked bootloaders in place, and now the company is trying to figure out how to reverse that. They're not sure how that'll happen, and thus not sure when it will happen either. But hey - at least we know it will happen.