The other 3 months league ?

I assume it would give GGG more work if they created two 3 months league rather one
4 months league and a months rest.

Does anyone know what the second 3 months league going to be ?

I would prefer if GGG concentrated in bringing out the Acts our rather than creating more stuff for another league

The 3 months league after the upcoming one will have their own special mods. Chris said as much in the last podcast he appeared in.

I doubt even GGG knows what those mods are at this point, they're working on the upcoming leagues.

We don't even know what the FIRST 3 month leagues will be yet. But adding a couple new mods isn't going to be THAT much extra work for them. Not nearly as much as a full mini-expansion anyway.