The Adaptive Policy on MR and MS is available on the latest firmware. I have checked internally and dont see any specific updates or ETA on if and when this feature would be available on the MX Platform. I would recommend submitting a feature request using the Make a Wish button on the dashboard, if you haven't already submitted one.
Could you provide some more context and details on what exactly are you looking for in micro segmentation. I am not aware of any specific feature with that name. If you could provide some details, I can get back with any possible way of achieving the goal.
Micro segmentation is based on filtering endpoint traffic directly on the access port. This allows SGT-based filtering even for clients within the same L3 network.
Based on that, MX (from my point of view) is not the place where „micro“ segmentation would take place. It‘d rather fulfill firewalling based on SGTs instead of IP addresses with inter-VLAN traffic just as ASA and Firepower devices already do. It‘d be a great choice if MX could handle that too tho 😉