With the incoming release of new champions, Riot are keeping on with the schedule for reducing the price of the old ones.
Usually Riot reduce price on 6300 IP champions based on the release of new champions, and on every third release additional champion priced at 4800 IP or lower also gets reduced to the lower tier.
There current plans are to reduce the prices of four champions.
Firstly Xerath will be reduced to 4800 IP / 880 RP and Miss Fortune will be reduced to 3150 IP / 790 RP. That however will happen on the first champion release after Lucian.
On the second released champion after Lucian, Graves will be reduced to 4800 IP / 880 RP.
With the third champion released after Lucian, Shyvana will be reduced to 4800 IP / 880 RP.
Source - League of Legends
