According to that advertisement found on a bus in Korea by a Soshi fan, SMTOWN concert will be held in Seoul olympic stadium on august 21st (that’s the week end after super show) and will start at 5pm.
There will be super junior, girls’ generation, shinee, f(x), Changmin and yunho (dbsk), trax, boa, etc. (see the poster)
There is no news what so ever yet online to confirm the other dates of that “World Tour”, and there is no date for the ticketing either (that will be held on Gmarket).
We will keep you updated!
Source: picture + see watermark on the picture.