Week 48 build is I believe when changes come in. Originally, mine was due for week 48 2021 build and I had confirmation it was going to have the 2022 model changes. In the end it got built in March 22. I have seen the reports of quad pipes and new screen/dash and personally I think the latter likely and not the former, unless we’re going to see an M140i style power upgrade. That also seems doubtful given the M240i fills the gap between M135i/M235i and new M2. Then again I’d put nothing past the car makers’ relentless proliferation of models we don’t need but admittedly they are very good at selling people!