Im sure we will also get some sort of MW mechanic to bring us in line with that.
I could see the current Haemonculi strat where they do the once per game MW bomb turned into a unit ability. IIRC, the fluff is that they have a grenade made out of tortured wrathbone. Everyone else can bring multiple grenades, not sure why the Haemonculi cant seem to find space to clip on a second one.