Holy fucking shit prepare your balls for May 2nd. The world will end at 19:10 GMT+9. For more info read this write-up that I shamelessly stole from reddit.
The GSL, now known as the World Championship Series Korea, is the most prestigious individual league in Starcraft 2. The premier division of this league - Code S - contains 32 of the best players in Starcraft 2. After 16 are knocked out in the first group phase, another group phase is played. Four players are seeded by the number of points accrued in previous GSLs. Each seed is a member of a different group and gets to choose their first opponent. The opponent they choose picks another, and so on, until there are four groups of four players, from which two will advance to the knockout rounds (Ro8 -> Semi-finals -> Finals).
PartinG, the winner of two world championships and arguably the best protoss player in the world, was a seed for this Ro16 group selection. Instead of picking an easy opponent, he picked his rival, the player who beat him in the final of GSL Blizzard Cup, and whom he knocked out in the last GSL - Life. Life is a prodigy, a freak of nature who has won five premier championships in the space of five months. He is indisputably the best zerg and best overall player in the world. Either because he did not want to show weakness, or because he is supremely confident, Life chose to add INnoVation to the group. Although he does not have the same resume as the former two, he is one of the two best terran players in the world and is in frightening form. With the crowd at his back, he completed the group of death by choosing Flash... the player who was a prodigy before it became cool, the greatest StarCraft: Brood War player in history, and the man revered as 'God'. He joins INnoVation as the other great terran player of today.
If each of these four players made it to the semi-finals, that would be the strongest semi-finals of all time. Whoever the two players are that advance from this group, either of them is a favourite to win the whole tournament.
TL;DR: The (arguably) best protoss, the best zerg, and the two best terran players are in a knockout group for the Ro16 of the most prestigious StarCraft 2 tournament in the world. Four man enter, two man leave.
Edit: Forgot to link where the matches will be streamed,
here.