Dates: October 12th to October 14th ( 3days and 2 nights)
Show date: October 13, 2012
Venue: (Undecided) Around Seoul, South Korea
Performers: SHINee, ZE:A, EXO-K, B1A4
In case anyone's wondering, here's a tidbit from an article depicting 2011's K Showw, since this year's should be similar:
"The event, which is marketed like a 3-day, 2-night travel tour, is open to 4000 guests; tickets can be purchased online through Green Tour. Upon purchasing the concert package, guests can depart from any of 11 different Japanese airports and stay at any of 6 different hotels in Seoul. The package includes arrangement of flight, hotel, and attending the concert."
Credits: Green Tour