The United States District Court for the Eastern District of Missouri will be upgrading its CM/ECF software to the Next Generation (NextGen) of CM/ECF in the spring of 2019. NextGen is the culmination of a multi-year project headed by the Administrative Office of the U.S. Courts to provide for the current and future filing and case management needs of all CM/ECF users. 

http://www.moed.uscourts.gov/preparing-nextgen