Ctrip seems to be getting more international:

They must have bought "space" on Tripadvisor to display their rates. (Hotel not in China)

However, seems the interface isn't working that smooth yet, as it doesn't display the final price (which isn't better of hotels.com or Venere anyway - so I'll go with them and 8% cashback...) on Tripadvisor directly, only once you click their link.