It is highly unlikely they reduce the squad size, as they just increased it. I think six has the potential to work, but they need to adjust one of two things in order to make it viable. One, gluttons get a 2" range allowing them to get full attacks from models in the back due to coherency, or two, they give gluttons a special rule that allows a unit of six models to act as though they only have five models with respect to coherency. Otherwise, they will remain practically unplayable to me. I'd rather have Leadbelchers or Ironguts than the current Glutton incarnation.