I'd have to agree, I don't mind changes to armies, new units, revisions but replacing a necron only rule with a bog standard rule is lame, and while doing so eleminating an army rule.And another army loses its character, and slides along the scale which will eventually make all armies the same.
making them pretty much invulnerable to instant death...I've heard speculation, but I really don't know.
But, then again, I've also heard that Res Orbs will go away, and that all Necrons will be T5 with FNP and Ranged Rending....
It's kinda hard to say what may be legit, and what is just wishful or malicious hoping. It's way to early to tell; Necrons are not even on the radar for the GW Dev team.