Analysts seem divided on whether this is the start of a more flexible currency regime for China or an old-style devaluation. It appears to be a bit of both. China's economy has been struggling and a weaker currency would give it a boost, although most commentators say a steeper fall would be needed for a real impact.
The length of time depends on the severity of the offense. Most points (illegal turn, not making a complete stop, driving over the speed limit, etc.) and/or accidents will stay on your driver record for 39 months (3 years, 3 months). Points for more serious offenses, such as hit-and-run or a DUI, will stay on your record for 13 years.
In general, most states allow convictions for moving violations to remain on your driver's record for three, five, seven or 10 years. If the ticket was for something minor, such as failure to stop at a stop sign, it may stay on your record for less time than a major offense.