Yeah they used to be, but I've never seen a list that specifies which programs switched to 3 years and which didn't. You can look for yourself if you want:
Go here
ACGME - Accreditation Data System (ADS)
Then "Program Search", then search for your desired program by Emergency Medicine and State, then click "View Program". It will tell you their ACGME accreditation status and the length of training they were accredited for by the ACGME.