Yes, Alexei (aka Bent Spoon Games) and I talked about the name recently; to promote its use in university courses teaching Bayesian statistics, we're sticking with Credence Game. Confidence means something slightly different in statistics, and the game is meant to teach not just calibration, but also the act of measuring belief strength itself. The name update on BSG, and in the app itself as downloaded from there, will happen soon enough.
Hey rationality friends, I just made this FAQ for the credence calibration game. So if you have people you'd like to introduce to it --- for example, to get them used to thinking of belief strengths as probabilities --- now is a good time :)