The only case I have that even closely resembles that is the tin that Serenity came in, and even then a normal DVD case was inside. That won't stick out further when put on a shelf with normal games/DVDs, will it?
I hope not... It looks kind of squat so maybe it's the same height as a regular DVD case. There is enough wasted space in regular DVD cases as it is that I sure hope they don't make them bigger. I guess the blue part is supposed to indicate it's a Blu-Ray game, but if there are DVD games for the PS3 will they be in regular cases? It would suck to have more than one type of case. I'm totally into having my games looking neat on a shelf.
I don't have a source, but I am positive I read in one of my gaming magazines (Game Informer or PSM) that Sony has decided that ALL PS3 games are going to be on Blu-Ray disks, no mix of Blue-ray and DVD.