Well apparently it's not a typo unless MS themselves also did it. It's listed right there on the Xbox website, 250GB 360 Value Pack (w/Skyrim DL code and Forza 4) slated for an October 4th release at 19,800 yen. (10,000 yen less than the previous 29,800 yen pricepoint for the 250GB 360.)
http://www.xbox.com/ja-JP/xbox360/consoles/250gbvaluepack
edit: Looks like it is happening as it is being reported in the JP news as well.
http://www.famitsu.com/news/201209/25021743.html
I took a screenshot:
http://i21.photobucket.com/albums/b258/smbu2000/games/360.jpg
starcraft: "I and every PS3 fanboy alive are waiting for Versus more than FFXIII.
Me since the games were revealed, the fanboys since E3." 
Skeeuk: "playstation 3 is the ultimate in gaming acceleration"
