In an attempt to help calm the woes of ranked queue-rs everywhere, Riot is trying out a new change that will make it so summoners can not choose any of the weekly, free to play champions when they queue for a Solo ranked game.

Free2Play Champions are being removed from Ranked Solo/Duo Queue soon unless you own the champions. We may revisit this policy in the future, but we are going to test this out.

- Lyte, Game Designer, via the official forums.

Lyte went on to explain the choice in a little more detail:
In brief, we are exploring various hypotheses...
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