New DVD Release Dates is showing an estimated release date of March 25, 2014 for 47 Ronin in the US on their site. Looks like the DVD will be released before the film has a chance to open in all of its international markets.
Info is here.
Update: Another site, DVDs ReleasDates is just saying March 2014. the Blu-ray will sell for $23.99 on Amazon and the Blu-ray 3D will be priced at $34.99.