The Yangtze fresh water dolphin (or Baiji 白鱀豚 in Chinese) was recently declared to be extinct after a survey expedition failed to spot any of the species. but faint hope was stirred when the animal in video footage of a sighting was identified as this species.
Nonetheless, researchers still consider the species as functionally extinct. Hopefully, the Yangtze finless porpoise will not follow in the Baiji's fate. Personally, I think that the finless porpoise has a better chance due to its "cuteness factor."
See this video at current.com.