What the article was referring to was that when asking how long someone had been looking for work, there was an upper bound of 99 weeks. Anything more than that was classified as 99 weeks. So this change won't affect the number of unemployed, and probably won't change any published numbers (since Table A-12 of the Employment Situation, duration of unemployment, only has the categories of less than 5 weeks, 5 to 14 weeks, 15 weeks and over, 15 to 26 weeks, and more than 27 weeks.
All this does is allow better calculation of long term unemployed. Here is the
BLS AnnouncementEffective with data for January 2011, the Current Population Survey (CPS) will be modified to allow respondents to report longer durations of unemployment. Presently, the CPS accepts unemployment durations of up to 2 years; any response of unemployment duration greater than this is entered as 2 years. Starting with data for January 2011, respondents will be able to report unemployment durations of up to 5 years. This change will likely affect estimates of average (mean) duration of unemployment. The change will not affect the estimate of the number of unemployed persons and will not affect other data series on the duration of unemployment.
bolding mine