Firaxis recently announced that it had partnered with the creators of an acclaimed mod for XCOM: Enemy Within to offer mods right at the launch of XCOM 2. During a PAX South panel this weekend, we got out first look at what those mods are.
The third launch mod introduces a new development path for soldiers. It's described as a "leader mod" and is said to be similar to the officer mod seen in The Long War. It allows you to train high-rank soldiers with new abilities that help the team, such as one that gives a mobility bonus for one turn to nearby allies.
The way this works is compared to how Psionic classes functioned in Enemy Within, where there is an additional set of choices on top of a soldier's base class. There are, of course, some tradeoffs; not only will it take time and money to build these leaders up, but only one can be deployed on a mission at a time except in "some very special circumstances."