I didn't know there were 5.
But they are not new buses. They're an older model bus with a new wrap.
The new buses have the silver and maroon color scheme.
The link also talked about the electric bus and the articulateds. The electric bus was strictly a test; I don't think it's on site anymore. As of last week, the articulateds had not arrived yet, except for one that was being used for testing only, not Guest service. It has the new silver & maroon paint scheme, but last I saw it did not yet have the Disney Transport logo on it.