Yes, the full license will include an API key to use my management sever so you can get up and running right away.
So there are three components to this setup. The login/management server, the world server(s), and the UE4 client. With the developer license I am letting you use my login/management server, but you are still responsible for the world server(s). For most developers this will just be their local PC. The world servers are actually running the UE4 server instances that the UE4 clients are connecting to.
Initially you would probably just develop on your local PC and then later when you are ready for an early alpha test you can spin up some virtual servers at a hosting company to act as more permanent world servers to test with.
As far as limits on the developer license, I will not be limiting the number of maps or zones, but I will be limiting the number of players/characters. The number I have in mind is somewhere around 50. I believe that 50 is enough to develop an MMO as a hobbyist and play with your friends, but when you have more than around 50, then you are probably publishing the game or doing a large alpha test at which point you will need a full license and your own infrastructure.
The consulting would probably just be an hourly rate. I don’t currently have any plans in mind for a default launcher. I assume most released games will want their own custom launcher to handle their game updates anyway, but it may be something I look into more. We’ll see.