This was just mentioned by Deficio and Sjokz in the broadcast.
With FNC having secured at least 3rd place in the split, they have probably decided to try out another rookie and possibly cultivate the strategy so commonly seen in the LCK - which is actively using substitutes to enable different team comps and strategies.
Bwipo's op.gg:
http://euw.op.gg/summoner/userName=fncbwipo
EDIT: Added sOAZ's comments on Twitter:
https://twitter.com/sOAZIZGOOD/status/972521566004269062
We had it planned for a week that @Bwipolol will be playing this game and splited scrims for the entire week, i'm excited to watch the team play and i believe in him, he is really smart about the game for a rookie and better than most tops in EU imo, no pressure
more time for me to get drunk and party and play dota !
jk
