I would think the monthly codes are done as they said they were just for the last 3 months of the year, but they could do same next fall! Also they seem to like to toss out codes for special occasions, so I'm sure you will see one for Valentines day, Easter, etc.
The in game events will carry on as well, would love to see more that give away things like spell books and other items normally raiders or people who can farm billions of adena get.