Personally, I think it is a set of add-ons to the existing one. Otherwise this might be shooting their own foot.

DroneDJ: DJI leaks photos of new DJI RoboMaster. To be released on March 9th?.
https://dronedj.com/2020/03/04/dji-leaks-photos-of-new-dji-robomaster-to-be-released-on-march-9th/

Hi, thank you for bringing this query to us. As of the time being, we don't have any information regarding DJI's future products, please stay tuned to the latest news and events by subscribing to DJI official website at www.dji.com or following us on social media platforms below. Thank you for your understanding and support!

Facebook: https://www.facebook.com/DJI

Twitter: https://twitter.com/djiglobal

YouTube: https://www.youtube.com/user/djiinnovations

It is a new robot, the Robomaster EP, analogous to the engineer class in the big Robomaster competition.

It has an arm.

Look at what i found. It showed up yesterday.

https://github.com/dji-sdk/RoboMaster-SDK

There are several mentions to Robomaster EP.

The commit messge for the SDK code seems to point to the fact that the EP and S1 are, indeed, different products. I atill hope the S1 can be " upgraded to EP.

RoboMaster Developer Guide V0.1.0 released

NEW:
    1. Add SDK Usage Guide for RoboMaster EP products.
    2. Add Python API Reference for RoboMaster S1 and EP products.
    3. Add Expansion Module Usage for RoboMaster EP products

NOTE:
    PLease make sure your robot is at the following version and above:

    - RoboMaster S1: V00.05.00.00
    - RoboMaster EP: V01.00.00.00

OTHER:
    We are committed to creating a robot with the most educational significance,
giving simple and powerful programming functions, and providing complete programming
documentation, example code display, open source code of excellent works, etc.
to help everyone grow together. Now, this is only the first step We still have a
long way to go.

    If you have any questions, suggestions and comments about this document, please
feel free to feedback to us and we will reply you in time.

    Finally, thank guys(adam.guo, sirrine.lin, lance.cheng, luke.zhu, laura.lu)
for contributing to these document and code.