The remaster will bring a new epilogue to Shulk's story.
http://www.nintendoworldreport.com/news/53291/xenoblade-chronicles-definitive-edition-launching-may-29
Nintendo opened a Direct Mini with some big RPG news.
The Xenoblade Chronicles Definitive Edition will launch on May 29. The remastered version will include a special "Future Connected" epilogue following the game, as well as some re-recorded music tracks.
It can be preloaded today, and a version with a 250-page artbook will also be available worldwide. Europe will also receive an edition with a vinyl version of the soundtrack.