IVC have contracted me to update the Redis Foreign Data Wrapper, and Dave Page has been good enough to make a collaborator on the repo. Today I comitted the first bunch of updates, which was basically to provide a separate branch for building with each Postgres branch, just as was done not long ago with the File Text Array Foreign Data Wrapper. The REL9_2_STABLE and master branches were updated to reflect the FDW API changes that took place in the 9.2 branch.
There are one or two bits of the FDW I'm not quite happy about that I'll be digging into as I get time, so this isn't really finished work. I've also seen reports of the FDW inducing a crash, but I haven't been able to reproduce that.
There will be some more non-FDW Redis work coming along, too, but this is a good start. I hear of a number of companies building high performance web applications using hybrid PostgreSQL+Redis persistence layers, so the more we can make them play nicely together, the better off we'll be.