No chance. Times are too good for PRC now. The future even better. So why should PLA upset the golden gravy train. Coups only happen in countries when certain groups feel their future is at stake; when they feel they have a convenient silly excuse and a good chance to succeed. a.k.a. Thailand's coup when Thaksin tried to clean up the powerful narcotic drug lords.
Not yet under arrest but everyone believe it will happen soon. Currently, he is under investigation from the central government.
He have many connections in Beijing and his wife have made millions using his position. It is hard to escape arrest if the Wen want to bring him down.
Just pure speculation, if there is really a coup within the PLA and the factions, it will never be leaked out officially. What you see and hear is all manipulated by the Press and speculation and guessing game from the outside China. That's my 2 cent worth of opinion.