China Defense Blog found these photos showing the Varyag with lights on. Defense Tech also noticed that in the photo with the white/yellow lights, there is a JBD (Jet Blast Deflector) in the raised position.
This is not the first time the Chinese have shown signs that they are nearing the Varyag's sea trials. Back in May, photos emerged showing exhaust coming from the Varyag's funnel, and more recently there were photos showing constrution equipment being removd from the Varyag.
All this points towards the Varyag being almost ready for sea trials, and then maybe some intimidation in the South China Sea.