We've already gotten a glimpse of some of RIM's PlayBook demo at the recent TabLife conference, but Rogers has now finally posted the complete video of what may well be the most comprehensive look at the device to date. That includes a peek at the most recent software build, a demonstration of 1080p video playback, and a look at the device's "true multitasking" capabilities -- which, incidentally, was all demonstrated using just one half of the device's dual-core processor. What's more, RIM's David Neale also confirmed that the device will indeed support 4G at so
