The HTC Mytouch 4G Slide first appeared on Phandroid's radar as the DoubleShot in early March 2011 but we haven't seen much more than a preliminary list of specs and FCC filings. What we have heard is quite impressive. It will run Qualcomm's new 1.2GHz dual-core Snapdragon processor, will come with Android 2.3 and has a hardware QWERTY keyboard.
Some folks are speculating that the early name of "DoubleShot" could refer to dual-cameras for the device to facilitate 3D content recording (as seen in some spec leaks) but more than likely DoubleShot may also refer to the dual-core processor found inside. We expect to see this one headed to T-Mobile sometime this summer.