I saw the same GDC talk; very cool stuff!
That being said, I believe he used interp with a curve for 99% of his animation. Jeff Farris touches a little bit on some of the other interps here: The Subtle Magic of InterpTo() - Announcements and Releases - Unreal Engine Forums , and goes on to say that some of the math isn’t available to BP just yet.
Sorry if that doesn’t get you in the right direction.