A couple of days ago, HTC revealed their bootloader unlock portal and started with 1 of the 3 (so far) promised devices - the European Sensation. The EVO 3D and the T-Mobile Sensation 4G remained MIA for the time being.
Notice how the Sensation was unlocked shortly after receiving an Android 2.3.4 OTA, which apparently gave it its "unlockability." Now remember what happened this morning? Yup - the EVO 3D also got the 2.3.4 update and, you guessed it - it's now unlockable at HTCDev.com.