The plot is over, but you can still complete plot steps till 31st December:
The plot is over, but the puzzles will still be available until the end of the day NST on 31 December. (That is, until 2010-12-31 23:59:59.) As soon as it's 2011, the puzzles will be disabled so that we can tally scores. So complete those achievements while you still can!
Also, Faerieland looks different now.