Server Rental
Servers are rent-able through an in-game transaction. When renting a server, the user will have the option to specify the server name, type (public or private), map, player cap, and duration of the rental period.
 Public Servers
Public servers are available for anyone to play on. They will have a player cap of at least 200 and will feature random loot spawns, however they are currently limited to up to 100 players.
Sergey has stated that at 200 players, you should theoretically meet a player every 15-20 minutes. All depending on meet/or be killed by. That is just an estimation though. It all depends where you are. On the 100 population servers if you are near a common city than you will run into player very very often. 5-15 minutes. So 200 will be very crowded.
 Special Servers
Special "Strongholds" servers will be available for purchase.