Yes, and why increased to 7800 during the first week? Because they are reducing the cost of older Champions to compensate. That's great for people who don't own older Champions -- but that is NOT great for people who own everything! Essentially this is just a pure negative to long term supporters instead of balancing it out for others.
6300 IP over a 2 week period = 9150 over a 3 week period (assuming equal gameplay time)
So you will actually net more IP per week than you did last season even purchasing them at the increased 7800 IP rate, all things being equal. Not that you could spend excess IP on anything anyway :-) So this change seems to help new players and is irrelevant for the long-term IP earning community. Win/win.