Plan - it is a four letter word

According to the PTB, plan must be a four letter word. That is the only reason I can think of that they are keeping EVERYTHING close to the vest: the room you are in, the number of students you will have, etc. We already know we will need to buy supplies - everything from paper to dry erase markers - but wouldn't it be nice to know if my classes are 25 students or 40?

I guess they think we cannot complain if we don't know - fooled them!