From the post Towards Developmental Interpretability:
The high-level near-term plan (as of July 2023) for developmental interpretability:

• Phase 1: sanity checks (six months). Assemble a library of examples of phase transitions over training, analyze each of them with our existing tools to validate the key ideas.

• Phase 2: build new tools. Jointly develop theoretical and experimental measures that give more refined information about structure formed in phase transitions.

I will ask @JesseHoogland soon after the resolution date what he thinks.