http://freesherlock.files.wordpress.com/2013/12/klinger-order-on-motion-for-summary-judgment-c.pdf
Federal judge Rubén Castillo has Issued a declarative statement in a case against the Conan Doyle Estate, LTD., declaring that story elements predating January 1, 1923, are in the public domain.
I've only skimmed the document, and one still has to step carefully, but it looks like the more than a century old characters and stories are finally in the public domain, long, long past due.