New server is unavoidable in the long-run, however, the main focus will always be this server or most likely even both of them at the same time thanks to multi-world technique. Moreover, in the highly likely event of a new server, players will be allowed to be on-line on both servers at the same time, so you will be able to make runes on one server while hunting on the other. This way the population on both servers should be sufficient. Also, I believe that new server will bring new players to this server too.
Multi-world guarantees all Tibianic servers to be always up to be with each other. It simple means no missing features and no abandoning one server over the other. Also, it is important for players to realize that we will not reset any server, and in case of any failure a world merging process will take place.
To make the long story short - new server will happen. When? Hopefully during Christmas but that's yet to be determined. Remember that the new server will be locked with a key (purchasable, the price is not set) for the first two or one week(s) to avoid any massive depopulation of the current server.
Please refer to my other information regarding the new server here
http://tibianic.org/forum/topic/13823/12/ at the bottom.