It will be interesting to see if they might just deal with Jack's escape before the next series starts, either in a 10 minute prequel piece or just kick off the season with Jack escaped. They've ditched other plot points quite easily before (the conspirators in series two and Almeda going to prison at the end of series three).
At the moment I reckon he is going to turn up near or in the USA for whatever reason (a mission for the Chinese perhaps or he will already have been used as a bargaining chip), I seriously doubt they will commit to having an entire series set in China. For a start it would take far too long to return to the USA (and are they going to actually film it in China eh?). Though, going by the ridiculous liberties they have been taking with the clock this season who knows? He could break out of a Chinese prison in episode one, run across the Chinese border in episode two and be having an angst ridden moment with Kim in CTU by episode four.
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