In the Gehrmans Musikförlag catalogue 2009-2010 the preliminary cover of “Best of Roxette” was published with the release date in the autumn/winter 2009. As you may remember, according to several Swedish websites, the book will be released on March 21st. English words on the cover may suggest that the whole book (with Per Gessle’s comments) will be written in this language. On the other hand, there was also informations that the songbook would be in Swedish.
Source: Gehrmans Musikförlag catalogue