To slightly modify what I wrote earlier (and to keep the discussion going), I'm hoping the rending part of the Apoc rules stays around. Otherwise... what would be the point?!?
On a side note, is this a possible sign that heavy weapon platforms are on the way out? If the all get mounted on tanks, I would say that makes them more viable. I would particularly be interested in seeing the vibro-cannons ala the old Wave Serpents. They have the new turret. It would be a waste not to get the most out of it.