It is not at all uncommon for online retailers to break the finer details of any given game; Sonic included. EBGames/Gamestop.com has recently revealed the box art for Sonic’s latest DS adventure, “Sonic Rush Adventure”. You can see it at the game’s page, here.
In addition to the box art, EB Games has also revealed SRA’s release date in the US: September 19th. The retail site also has NiGHTS: Journey of Dreams listed for November 13th.