i would love to know too,
I think it really depends on the particular charter, hard to speak for all. In my area we have at least 2 charters I know of and I am considering them for dd. Although we have about 3 years before she goes. She will start off in a private school, but I am not sure we can afford it long term, or once we have more kids for more than one, assuming I am staying home still But of course if it is the same thing as our 15,000 a year school for free I'm all for it!
I have heard that all of the teachers in our charters are trained waldorf teachers. That can be a problem with charters that the teachers need to have their teaching credential first off and ontop of that have waldorf and in many charters it doesnt happen I think.
The charters here do celebrate the holidays, have blessings. The main difference i see honestly is that the private school campus is amazing while the charter schools look more like a typical school with some waldorf influence, physically, no amazing play areas, forts, forests, farms etc.