As noted, WWE originally planned for the King of the Ring tournament to take place over the course of several weeks, but then of course changed plans and the tournament took place over two nights.
According to F4WOnline.com, the original idea was for WWE Network subscribers to receive part of the tournament free in the month of April, but then have to pay to see the rest when it concluded in May. The likely reason for tournament plans changing is WWE decided to once again make the Network free for new subscribers in the month of May.