USCIS has released a revised version of Form I-129, which will be the only accepted edition starting May 1, 2015.
The U.S. Citizenship and Immigration Services (USCIS) has announced the availability of a revised Form I-129, Petition for a Nonimmigrant Worker. This updated form is marked with an edition date of October 23, 2014.
Beginning May 1, 2015, USCIS will only accept the October 23, 2014 edition of Form I-129. After this date, previous versions of the form, including those dated October 7, 2011, January 19, 2011, and November 23, 2010, will no longer be accepted.
USCIS encourages individuals to download the revised form, as it is designed to prompt users to provide complete information. This enhancement aims to improve the efficiency of the processing of the form.
For more information on who may file Form I-129 and to access the revised form, visit the USCIS forms website.
According to USCIS, the changes are intended to streamline the application process for nonimmigrant workers.

