This is a screenshot taken straight from the CPT website for the upcoming 2020 season. The link to the actual page is in the Sources section below.
As for why this could be a sign of Street Fighter VI coming in 2021, I should probably let Chelsea explain that.
This isn't a sure-thing, especially when the Capcom Pro Tour also has other changes for the 2020 season. But considering what happened in the past, it's possible that this is a signal of SFVI being out in time for the 2021 Capcom Pro Tour. If that's the case, hopefully they don't rush it out like they did for SFV's launch.
Sources: Capcom Pro Tour, Chelsea (Twitter)