according to this comment by valorant's global esports communication manager, the vct format will most likely be something like 2 groups of 6 with the brackets looking like emea ones, with(my speculation) the top 2(winners of lower bracket finals and upper bracket finals) advancing to the next stage, which might be 4 team double elimination
so the brackets may look something like this:-(most of these are random seeds except g2, prx, guard)
group 1
group 2
and then the teams could go into 4 team double elim like latam playoffs
https://www.vlr.gg/event/925/champions-tour-latin-america-stage-1-playoffs