GF 5 will bring out the aweful truth, that which we have dreaded to ponder, the reason that the shapers have kept the shaping powers so secret... see, long long loooong time ago the lifecrafters invented a new creation, one which was intelligent, functional and in the end gained shaping powers themselves... these were the humans, which were created in the shaper's image (except their noses were a little smaller...) These humans eventually rose up against their creators and after a long struggle actually defeated them...and enslaved them...and reshaped them... into the simple serviles which we know of today. Anyway, the "Creators" have returned to Terrestia, and man are they p*ss*D off, at the humans, and the serviles in the revolution, all degenerate children of the shaping arts... it will take a united coalition of Shapers and Rebels to save Terrestia from the new threat of the "ancient creators"...
Anyway, that's how GF 5 would look from my humble perspective...