I have never EVER heard this rumour before, but what's interesting me about it is that we have strong rumours that there is a Vect/Dias of Destruction model already in existence, and you don't even mention it really, instead you bring up this super nonchalant rumour that sounds plausible, and in line with the direction GW is currently heading. What's interesting is no one has really asked for a Kabal supplement either, most people I've seen have wanted a wych supplement to make the sets they keep pushing worth buying.
I'm going to hold on to this, and see if what comes.