Chinese authorities have begun systematic enforcement activities in several provinces to locate foreign teachers who are working illegally. Requirements to work legally have been elevated in Beijing and Shanghai. Recruitment agents and Training Centers employing foreign teachers without proper foreign expert certificates are being fined. The foreign teachers are being deported, often without pay.

How do you know all this? Are your sources trustworthy?
How about the elevations in the requirements to work legally in Beijing and Shanghai? What are they precisely?
Which provinces entail 'the several'?
How about the autonomous regions? Are they exempt at this time?
Are Hong Kong visa runs to replace L visas for China with Z visas for China still doable?