This is all probably already confirmed elsewhere. Though I didnt see it in the current necron thread, which at its current state didnt seem like the place to post this.
GW sent out an email for NA news and events for November. The email contained two pictures of Necrons. The picture link for the Hobby Centers was a section of the new Necron Codex cover. The second a picture of Necron destroyers picture link for Independant retailers. (I hadnt seen the destroyer one before, atleast not with the coloration) I suspect that
GW will send out an email tonight or tomorrow with all the info we already know. And hopefully some new pics to tease and get us interested.