It is my understanding that it would require a soft fork
"Once miners representing 95 percent of hash power (1,916 blocks) within a single difficulty period (2,016 blocks/about two weeks) include the right version bit, the soft fork is locked in. One difficulty period later, the soft fork is activated, meaning the remaining 5 percent of miners have about two weeks to upgrade."
It is my understanding that it would require a soft fork
"Once miners representing 95 percent of hash power (1,916 blocks) within a single difficulty period (2,016 blocks/about two weeks) include the right version bit, the soft fork is locked in. One difficulty period later, the soft fork is activated, meaning the remaining 5 percent of miners have about two weeks to upgrade."
Ah, fascinating...