Sense 3.0 is coming pre-loaded on last-generation HTC smartphones like the HTC EVO 3D, HTC Sensation and the upcoming myTouch 4G Slide (Doubleshot), Kingdom, Rider and so on but it looks like some of the goodies were already extracted from leaked ROMs and made available to the public.
XDA Developers have extracted the lockscreen from the Doubleshot leaked ROM and turned it into an installable apk file. There’s no need to do all the recovery and flashing whitchcraft. If you have a Sense Gingerbread ROM on your smartphone, just follow the source link and download the apk file, install as you normally would and enjoy the new lockscreen
Source: XDA Developers