The bigger picture is here: https://www.eecs.mit.edu/eecs-reorganization-plan/

Wow, no more 6-3 — that seems more significant!

I chuckled at “6-2 (old)”. The 6-2 label was recycled some time in the last 25 years (since I graduated, at least). It was previously (until sometime in the 1960s I believe) power transmission systems.

For context: https://thetech.com/2021/11/22/6-4-ai-d-major-proposed