The band is currently plus or minus 2% from the central rate set each day by the People's Bank of China
- That's for the 'onshore' yuan, CNY
For the 'offshore, CNH, that can trade wherever the market takes it
Anyway, a widening of the band constitutes a slight relaxation of the restriction on yuan trading. CNY is not under too much pressure either way right now, so its likely a good time.
Let's see what comes of it. My connections within the Chinese Politburo are not what they should be, so I have no inside info :-D
ps. Report is in 'Financial News', a People's Bank of China outlet. No sources named for the view.