I found this on the download page of RobotC for Mindstorms:Functionality Missing/Still in Development:
EV3 External Controller (TETRIX, MATRIX) Support
Daisy Chaining EV3's together and using chained motors/sensors
Wifi Download and Debugging
Synchronized Motor Functionality
Joystick Support for EV3
File System Commands (Read/Write files in a ROBOTC program)
Also, nMotorEncoderTarget is not supported. Will it be supported or deprecated?