Nick P reports that he has spotted Rogue One home DVD, Blu-ray and Blu-ray 3D formats for pre-order in Australia at EZY DVD. Nothing unusual there because it's also up at Sanity and JB Hi-Fi (as well as their exclusive steelbook/tinned box set version) - but the EZY DVD page lists a release date of April 28th. Seeing that the scale of this movie is massive this is very likely to be a worldwide availability date.
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Rogue One Home Release Pre-Orders