It seems like Dreamhack is no longer hosting all WCS events this year.
Instead StarLadder will be hosting WCS Spring and Summer in Kiev.
The first of the two Kiev WCS events will be held from the 17th to the 19th of May, while the second one will take place from the 12th to the 14th of July.
WCS Fall wil be hosted by Dreamhack and will happen in Montreal from the 6th to the 8th of September.
Note: Finally, the full Circuit will be presented in 1080p resolution for the first time!
"We tested a rule change for players competing in Season 1 of GSL, restricting them from participating in Season 1 of WCS Challenger. Our goal was to limit the number of WCS Circuit players who would compete in the Korean tournament, but instead it caused all but one of the registered Circuit players to pull out of the GSL competition. That was not our intention, and we are rolling back this rule for Season 2 and 3, bringing the residency rules back to as they were in 2018."
WCS 2019 outline:
More info provided by Aeromi: