They have already released Devstral, which is a tool-specific finetune of the same base model. That works pretty well with cline (even though it was specifically tuned for open-hands).
This would likely be a good model for the "plan" mode in various agentic tools (cline, aider, cursor/windsurf/void, etc). So you'd have a chat in plan mode, then use devstral to actually implement that plan.
Devstral is targeting tool use+coding I think, so something like Magistral but also tool calling (during thinking) would be handy too, just for other use cases. But also beneficial in the context of creating plans for Devstral.