ethitter/wordpress-redis-backend — pull request #1 by Einkoro (2014-02-28 03:14:03+00:00)
Title: Predis 0.8.5 support

Also supports using Predis installed via pear rather than as a submodule: http://pear.nrk.io/

Doesn't look like any API changes occurred that break compatibility from what I can see in the change log:
https://github.com/nrk/predis/blob/v0.8.5/CHANGELOG.md