Invictus Gaming will not be using their trademarked top laner Liu 'PDD' ?Mou.
While the rest of the roster remains unchanged, the upcoming Demacia Cup will see PDD not being utilized. In his place, the most likely replacement seems to be YongSu, a top laner for amateur Korean team Mook Comet. While the reason isn't fully known, rumors in China suggest that PDD may be suffering some minor health issues.
With their full roster, Invictus Gaming were able to take second place in the 2014 LPL Spring Season with PDD utilizing champions like Kayle and Jayce in the top lane.
We will continue to investigate the issue to understand fully why PDD, the rock of his team, will not be participating. The tournament will play through December, so PDD may make a return.
EDIT - Other sources suggest that PDD has confirmed retirement. This was announced when Xiaoxiao casted OGN.
Source - Game.163.com