About 25 years ago or so OSU promoted an "Early Soybean System".  The idea was to plant an early season beam (I think group 2 or so) early in hopes that the plant would set pods before our typical hot mid August weather and then harvest in September.  I typically had better yield with the later planted and longer season beans. 

One grain dealer here suggested that for a rotation with wheat to plant the later beans right after wheat was cut.  Those beans would be ready about frost time, let the ground lay out in the winter, and then plant the early beans the next year so that they would be harvested in time to plant wheat that fall.