User blog comment:Mich, Michele & Kuhla/Future Units Preview/@comment-86.5.208.177-20160127191026/@comment-27518538-20160127231714

It's a new way of improving your units once you have fully maxed their level/BB level etc, you can gain 'points' by fusing stuff to the unit like Frogs and fodder, fodder only gives a chance at points while frogs are guarenteed, you spend the points on different categories of you chosing, so you can choose to spend them to improve your stat parameters, or improve spark damage or bb on spark, etc.

Note that not all categories can be upgraded, so you have to choose which aspects of the unit you want to improve