Seems like there will be a Korean 20th anniversary stream for StarCraft tomorrow on april 10th, 19:00 KST. If I understand this correctly the show will start with a StarCraft talk show and will be followed by a StarCraft 2 Korea vs The World match.
plus a secret/special guest (not sure if google translate can be trusted, it says "그리고 특별초대선수")
MajOr aka Special
Hopefully Korean speakers can confirm this and add some more info.