The companions ARE official books from peginc.
The superpowers one would be with a new mechanic, that differs from the book. Basically, every super hero has an Arcane Background: Super Powers that gives them 10 Power Points to buy Super Powers with. They can also take an additional Major Hindrance to gain 5 more Power Points. They can also purchase Power Points as an Edge one time per Rank. At novice,this means they can buy it with their Free Edge OR one of their Hindrance Edges OR with one of their 'level ups' at 5/10/15, BUT not multiple times (i.e. use their free Edge for PP and one of their level ups for PP). In other words, the most PP a Novice character can get for powers is 20.
Powers have different costs. Their is a base cost for a Super Power. There are 'super power' adders that add some points to the base cost. There are 'super power hindrances' that subtract from the cost. There are also things like 'switchable' which lets you buy a base power for a certain amount, and then another power for 1/3 cost which can alternate being 'turned on' with the first power. There are device or focus type modifiers, that make powers cheaper if they are obtained from some item.
There are a lot of different modifiers that require a section of their own to make work for the Super Powers Companion. It would be AWESOME if my Herolab worked to make that so.
Cheers,
Texaspoet!