Looks like the limit to the level of enemies has been removed and is no longer capped @ lvl 40 for league battles.

@runvs Yes. For some players. Hopefully it is just a test.

Given they obviously think it's a fantastic idea to make leagues impossible for a lot of players while making them compulsory to do (for events and alliance etc), I suggest everyone needs to express their outrage to the support, else they will assume we all agree with this ridiculous change and we'll get stuck with another one of their **

edit: language per forum rules, though I agree with the statement 1000000%.