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If I remember, the message said something like: it expires March 31, but you can continue to use it, indefinitely, and will receive a warning once a day.
A reason not to use ACR 6.7 RC indefinitely would be that there appear to be some brightness or strength inconsistencies in some of the PV2012 renderings (Clarity = 100% is one) between LR4 and ACR 6.7 RC, but I would expect there to be a release version of ACR 6.7 with its current issues corrected.
Thanks. That was very useful information. I do not go into PSCS5 much but there are times I need some functions in my processing. Hopefully, the new release will be ready soon.