Microsoft's Aaron Woodman just pulled off a little surprise here at The Engadget Show: he brought out LG's Windows Phone 7 Series pre-production prototype! The QWERTY slider is the first branded Windows Phone 7 Series device the world's ever seen, and while the hardware and software are both obviously early, we can tell you a few things about it: it's just a hair thicker than an iPhone or Nexus One, there are dedicated hardware camera, volume, and power buttons in addition to the back, home, and search buttons dictated by Windows Phone 7 Series, and we noticed a five megapixel camera with a flash on the back, along with a headphone jack. Can't say much apart from that right now, since things are so early and everything is subject to change, but things are certainly moving along. It's all going down on the show right now -- see it on video after the break!