No, the protesters are not after some human rights or freedom, and they haven't been jailed, to the disappointment of lots of ppl on this board.

This one in Chengdu, in the Southwest, over a proposed petrochemical plant.
China Petrochemical Project Opposed - New York Times

This is a bit earlier, over a railway line in Shanghai.
FT.com / Asia-Pacific / China - Protests suspend work on Shanghai maglev