Few things i reckon we will see.
1_Many more female / girls racing. Malin Karlsen is doing a great job and Xray have had the foresight to see it's a great PR story backing her.
2_Everything will be linked to your phone - ESC's already are - All transmitters will be too and hopefully your PT will be too so you can see / hear / record your laps and more.
3_Wireless - no more wires anywhere apart from maybe the Lipo.
4_If Lipo / Battery technology becomes much more advanced - we may see different shapes and sizes - or even Lipo's that are built into the chassis etc.
5_More advanced materials - lighter / stronger.
6_On board telemetry that can make changes to the car as it's running - more intelligent servos and esc's etc.
7_Aerodynamics will become more important - lower faster cars as components become smaller / lighter.
8_Suspension / springs and oil is still very old school - maybe we will see technology impact on this like with full size cars.
9_RC racing has become more 'professional' over the last few years and I reckon this will continue as the hobby / sport becomes more widely known and available to watch online etc.
10_If the entire car is 'wired' - image being able to download a setup sheet online and simply up-load it to your car - no more spanners