They said on the livestream that the only thing they touched up on was the cape. Nothing else was improved and judging by the downgrades from their previous reissue figures like Obi-Wan, not much hope that Grevious is gonna turn out better from the first release.
According to what was discussed during the live show that just ended a few minutes ago the face paint apps, eyes paint apps, cape and joints were all improved and a better stand is included.
Whether that’s all true or not remains to be seen but that’s what they were saying.