Satesupo DX Dai-4-gou was put up on Satellablog on November 4, 2011:
http://superfamicom.org/blog/2011/11/new-rom-dumps-bs-x-shooting-extras/
This magazine appears to tie in to some Satellaview-related Derby Stallion events. More interesting technically, though, is it's unique format and hi-res graphics mode.
