Well, all they'll be doing for now is confirm blocks.

As the Ubisoft's representative said,
"During this first trial period of collaboration, we hope to help them in bringing it to a larger scale and experiment with the possibilities this opens up for the industry"

The part "first trial period of collaboration" leaves open a possible continuation of this collaboration, but so far it's nothing more than an experiment from Ubisoft which shows a little of acknowledgement toward EOS.