I posted a preview of China Q4 GDP and December industrial production here a little earlier:

Plenty of China data to come today - here is a preview of Q4 GDP

Check that out also for what is expected and timing (spoiler ... uncertain)

Preview via Westpac:

• China GDP has consistently beaten expectations through 2017, spurred on by external demand as well as a robust pipeline of investment projects that are proceeding to completion.
• It may again be the case that growth surprises to the upside; however, we and the market believe the more likely outcome is that momentum slows a tick from 6.8%yr to 6.7%yr.
• The basis of this view is partly attributable to the slowdown in investment currently being seen across the economy, in both residential and non-residential construction as well as other investment spending being undertaken by the government and corporates.
• Also key to the growth story is the consumer. Here we see robust demand, but not enough of an acceleration to more than offset the softening investment pulse.