It no longer summons at level 1.
In PvE battles, it summons for enemy at level of battle (that is, level of starting enemy troops), and at level 20 for player.
In PvP battles, it summons at level 20 for enemy, and seems at level 13 for player.
This may have some serious impact on pure faction delve, and maybe some other game modes.
Implies that the summoning at Lv.1 (which, PVP-specific bugs aside, was naturally far more beneficial to the player than the opponent) was a bug.
At least once the Campaign is over (and outside PVP restrictions), you can predict whether they will be relevant to a battle purely by the team composition.