I posted that, about a month ago, a well-known CM reported that characters were no longer allowed on rides. Within a few days, other visitors stated that they were still seeing this happening.
I'm not sure of the whole truth, but it seems that, if there is a general policy keeping the characters off rides, exceptions can be made by a lead. Perhaps the "general policy" was just reiterated.
The capper is, that I've just seen a new set of photos from this same CM, featuring Alice and the Mad Hatter on the carousel. The flickr photostream is here.

The capper is, that I've just seen a new set of photos from this same CM, featuring Alice and the Mad Hatter on the carousel. The flickr photostream is here.