We have mentioned and hinted at our new simulator that is running on the back end of AMR now, as of the Midnight expansion. There is an article up on the website that begins to explain the broad outlines of what it is in relation to past mathematical models and techniques we have used:
Please ask us any questions you have here or on discord, we are happy to discuss it! This is why we were working day and night leading up to Midnight - we wrote this entirely new type of simulator very quickly, and then had to debug all 40 specs! We are looking forward to releasing new features we have planned that are now possible with such a fast simulator.