UDON will publish the revised version of R20+5 later this year, which is the revised version of the Japanese Mega Man + Mega Man X 20th Anniversary Art Book (which was also localized by UDON, but split into two book, each dedicated towards each series).
via N4G: pc news feed http://n4g.com/news/1232260/a-look-at-udons-disgaea-atelier-growlanser-and-valkyria-art-books
via N4G: pc news feed http://n4g.com/news/1232260/a-look-at-udons-disgaea-atelier-growlanser-and-valkyria-art-books