The color codes indicating a potential terror attack will be eliminated. The U.S. Department of Homeland Security will likely send out elevated and imminent warnings on Facebook and Twitter. Some of the warnings may be withheld from Facebook in order to prevent exposure to an intelligence op. The system will be replaced on April 27th.
Sometimes the government struggles to decide how much information should be shared with the public. The color codes were the most visible anti-terrorism visuals, but it was criticized for being vague and it was constantly made fun of by comedians. The change of plan is not final as it was kind of a gut call.