Take a close look at those two clip below. A real close look - not only do the show of some really cool models without blur or the ever present minecraft effect. But if you look closely in the intro you'll see concept sketches for the rangers and vanguard - below those are other concept sketches of, what seems to be a magus or tech-pries and some sort of lovely evil looking bioconstruct? Next week?
edit: By the Omnissiah for once I thought I was fast and it turn out I was "out fasted" by a guy on BC http://www.bolterandchainsword.com/topic/302401-rumours-mechanicus-skitarii-codex-skitarii-confirmed/?p=3990268