According to this translated scuttlebutt, Super Mario Collection is a "revival" of Super Mario All-Stars for the SNES. We don't know if that means just a port, or additional included games, or further graphical updates -- though at 2,500 yen ($30) we don't expect extensive remaking. The "Special Pack" name reportedly refers to an included book showing material from 25 years of Mario game development, along with a soundtrack CD featuring music from the whole series.
Nintendo has scheduled the release of this game for October 21, which means that we should see official information very soon. It also means that No More Heroes 2, out in Japan the same day, officially has no chance of selling any copies.