Leaked images are out for the Genestealer Cults, showing two good images of the Patriarch and rules for first and second generation hybrids. As for as 40k is goes, they appear just "meh", with nothing that really seems to stand out or feel unique about this new faction. Of course I will keep my mind open until we see a lot more of the details.
If you have not seen the pics, here is a link to them on Bolter and Chainsword
via Omega-soul on Bolter and Chainsword
http://www.bolterandchainsword.com/topic/303604-rumours-deathwatch-overkill-deathwatch-rules-pg-29/?p=4316343