Google announced on Google+ that they are making an important change to the Google Click ID (GCLID), which is used by advertisers to track offline conversions.
The character length of that ID is changing from 26 characters, to range in length from 25 characters to a maximum of 100 characters. Now, if you have scripts that import the GCLID you need to make sure your script can handle the new character lengths of the GCLID.
The change goes into affect March 31, 2014, which is in about a month.
Depending on how your team captures and stores the GCLID values, this change in length might require some script and schema changes. We recommend that you share these changes with your team as soon as possible so they can determine if they need to update any of their systems.
More details can be found on the Google Ads Developer Blog.
Forum discussion at Google+.