There are many posts and discussions going around this, instead of putting all data here I have posted the links please refer .
Also the main change in vrops 6.7 is "capacity" .
Capacity Remaining Widget in Vrops 6.7
Please consider marking this answer as "correct" or "helpful" if you think your questions have been answered.
Please use the out of box dashboard named Utilization Overview and Capacity Allocation Overview and they will give you exactly what you are asking for.
Here are the youtube videos explaining these dashboards: