Most, if not all, titans are gonna be 3DCG. That includes "The Nine Titans".
Before WIT's CG Colossal Titan PTSD kicks in, you should know that the upgrade is so huge that there is no room for comparison.
The CG designs are top-notch, and the movements are pretty fluid!
Honestly, I think the vast majority of the audience wouldn't even recognize that the titans aren't actually hand-drawn!
The CG has a good amount of details to it. Expect something as good as their CG production in Dorohedoro!