There's a somewhat more extensive Yahoo article here. The lawyer involved elaborates on the "religious" aspects of the classes:
"'On the wall there was a poster that showed the Ashtanga, or 8-limbed deity. There are words showing what the limbs are,' he said. 'The ultimate goal is to be absorbed into the universe, which is called Samadhi. They had a poster depicting that. Fundamentally it is a Hindu religion being taught through Ashtanga yoga.'
"Children are also being taught eastern meditation techniques to calm themselves, where one clears the mind of all thoughts, poses that were imparted by Hindu deities, and in one class were trained in drawing mandalas, according to Broyles."