Okay, so I sent an email to the What's New Today staff regarding getting some information on the Necron release. Here's what I got back - nothing spectacular, but it does sound like the release isn't extremely far off.
First off, thanks for the email, it’s great to hear from you.
As you’ve probably guessed by now, I can’t really tell you a huge amount about Necrons because there isn’t a huge amount to say. When an army hasn’t been updated for a while, rumours will often start to circulate that the army is being remade. Sometimes this is correct, sometimes it isn’t. What I will say is that Codex Necrons has been removed from the website for some time now, which is a good indicator that something is being done with them.
My advice: If you buy any of the Necron plastic kits you’ll be fine – they will not be changing. Hopefully that will be enough to put your mind at rest for now. Otherwise, I’m afraid you’ll have to wait just a little bit longer. But, as the saying goes, good things come to those who wait.