No it will not work after the trial is over. I, too, noticed that during the switch from CS6 to CC that I made (to the subscription model) that my ACR in PSCS6 was imbued with all of the CC features. In other words, if you have a legit CC app on your machine, CS6 will be able to take advantage of the ACR plug-in features for CC. Once that CC app is no longer legit, CS6 will no longer be able to use the CC ACR version/features.
I assume it will behave similarly now - my experience with this was more than a year or so ago. I assume Adobe make it very easy to experience the newer features and camera support so will make the decision to go CC.