I'm excited to try this. My coding workflow lately has been to whip up detailed plans with Opus, leaving little to no ambiguity, and hand them off to Composer 1.5 to execute. Composer isn't the smartest model and ends up needing some hand-holding sometimes, but it does a good enough job, and it's
so damn fast that I can iterate on the result a few times before Opus would have finished. (And that's not to mention the cost difference, especially with Composer now being charged from the much larger "Auto" pool.)
If Composer 2 is as big a leap as they claim, I might start using it exclusively for anything that's not terribly complicated, including planning. The speed and cost effectiveness are just hard to beat.