The general setup is that of Distant Worlds, featuring a 70-plus piece orchestra that is local to the venue performing songs from the game series. One might assume that there won't be as much variety available as for Distant Worlds, but the Kingdom Hearts series does itself span eight distinct games now, not including remixes, remakes, and re-imaginings. I've never played a KH game myself, but I did do some sampling of the soundtracks for this post and I think it's safe to say that fans will no doubt find some very lovely music performed on stage. As a note, the Kingdom Hearts series features music composed by Yoko Shimomura, one of gaming's most prolific composers and the composer for the upcoming Final Fantasy XV.
The World Tour won't begin until next year, and is currently scheduled to appear in seven cities worldwide: Tokyo, Paris, London, Singapore, Shanghai, Los Angeles, and New York. The European shows all take place in March of 2017; the American shows are in June.