There has barely been any adjustments above 20% the last few months. This one (if it even is 25%, we won't know for another week) is clearly an anomaly and will be smoothed out with time.
Unlikely. Very unlikely.
How so? I find it more unlikely that a clear downward trend in difficulty growth that has lasted since fall last year would suddenly do a 180. I have the numbers on my side, I haven't seen any opposing evidence.
https://bitcoinwisdom.com/bitcoin/difficultyDifficulty History
Date Difficulty Change Hash Rate
Jun 18 2014 13,462,580,115 14.51% 96,368,902 GH/s
Jun 05 2014 11,756,551,917 12.44% 84,156,677 GH/s
May 24 2014 10,455,720,138 18.10% 74,844,960 GH/s
May 12 2014 8,853,416,309 10.66% 63,375,223 GH/s
Apr 29 2014 8,000,872,136 14.64% 57,272,474 GH/s
Apr 17 2014 6,978,842,650 14.04% 49,956,502 GH/s
Apr 05 2014 6,119,726,089 22.23% 43,806,706 GH/s
Mar 24 2014 5,006,860,589 17.80% 35,840,504 GH/s
Mar 13 2014 4,250,217,920 11.39% 30,424,245 GH/s
Feb 28 2014 3,815,723,799 21.92% 27,314,015 GH/s
Feb 17 2014 3,129,573,175 19.39% 22,402,357 GH/s
Feb 05 2014 2,621,404,453 19.49% 18,764,744 GH/s
Jan 24 2014 2,193,847,870 22.59% 15,704,175 GH/s
Jan 13 2014 1,789,546,951 26.16% 12,810,076 GH/s
Jan 02 2014 1,418,481,395 20.12% 10,153,885 GH/s