With some Power Functions elements and a few extra pieces, it's pretty easy to turn the Rally Car into an RC car.
Here's a quick demo video of my design in action.
And here are the instructions I made for it.
Required extra pieces
First you are going to need some extra pieces:
1x - Servo Motor
1x - IR Receiver
1x - Battery Box
1x - L-...
After a bit of research, it looks like this is a new part for 2018.
The part that it is likely replacing is the old flower petal with stud connections:
The new part has 5 petals instead of 4, and they are shorter so that they don't collide with neighboring parts at any angle. New Elementary did a writeup on the new flower parts that includes an ...
Unfortunately, this is common to several colors in the LEGO color pallette. According to this article on Eurobricks.com, The LEGO Group (TLG) made a change in the early 2000’s in how they make their colors: they used to have premixed color granules but abandoned those in favor of a system of white granules with colored dyes added in. This new system allows ...
This part was introduced for licensed polybags in the Racers Ferrarri line (30195 and 30190):
It has been used that way a few other times since then, but it has also been used a few other ways in released sets.
It was used in 95012-1 BARC Speeder with Sidecar to round out the back end of the CIS speeder nicely:
And identically in 75017-1 Duel on Geonosis: