HTC promised on its Facebook page to bring unlocked bootloaders to HTC Sensation (globally and on T-Mobile USA) and HTC EVO 3D on Sprint by the end of summer.
The change means that customers will be able to apply various software modifications and hacks on their phones freely - something a vocal part of the Android community has been demanding for a while.
In practice, it means that the phones will first receive a maintenance update in August, but the unlocking capabilities should be fully enabled in September.