No, I don't think Tesla is going to replace any 60kwh batteries with 90kwh batteries. I think they are battery constrained (for at least a few more years), and would have to charge HUGE prices to make it worth it to them.
Maybe after the gigafactory is up and running, if they are making more than they can sell. Then we all might upgrade, and with new cell chemistry maybe we'll get 120 kwh batteries!