Hopefully they learned their lesson from before and give it a CF roof and M Mirrors as standard.
If previous hints are true, the front grills will not look like the normal 2er but will be akin to the CSL hommage... not as tall as the G80/G82 but taller and more vertical than what we've seen leaked on the normal 2er.
I also see either a power dome-type of hood feature, or a hood scoop a la early 2000s mustang GT