First time trying FareLock... I am 4 days into a 7 day lock, with 3 days to go. I just got a reminder email at almost exactly T-72 hours. The email just plainly says "FareLock Reminder" with the fare and itinerary shown. It doesn't say when the FareLock is due to expire. It doesn't say whether I chose the auto-purchase option at the conclusion of the lock.
Suggestion: the email should have some text that says something to the effect of "your FareLock is due to expire in approximately X hours/days" and "this ticket will/will not be automatically purchased on Month/Day/Time"