Unrealscript was removed in the Unreal Engine 4, but now Epic realized that user created C++ mods are potentially harmful to target computers. Some Epic developers look for a solution to this potential security risk, without banning mods. May this be
the return of unrealscript?
There are a couple of people working on scripting systems for UE4 including C# and Java. Even Matt is working on his own updated version of UnrealScript outside of is work for Epic and it going to be really sweet. Now I don't think any of these secondary scripting system will ever become a part of the engine, so unsupported 3rd party add-ons will have to do.