The most noticeable changes are new light clusters front and rear that now feature LED lighting. The front bumper's detailing has been updated, and the standard foglights are also LED. Inside, new Digital Cockpit gauge cluster and renewed Professional navigation/infotainment display are expected improvements, and there is inductive phone charging available in the armrest – along with Apple CarPlay integration and a WiFi hotspot. BMW has focused on connectivity in recent times, and the facelifted 4 Series follows suit. BMW's "Connected" setup is in the manufacturer's words "an all-compassing personalized digital mobility assistant", and by utilizing up-to-date traffic data it will tell you when you're supposed to drive off if you plan to make it to your destination in time.
In addition to all the standard mid-cycle stuff, it's good to see BMW has paid attention to the 4 Series' dynamics. The new cars will feature a stiffer suspension setup and upgraded steering; especially welcome since the 4 Series' steering has divided opinions, and the revisions could bring sorely needed benefits at the helm. The suspension improvements, which reduce roll and create "more neutral responses at the limit", will be included incorporated into the standard suspension, M Sport suspension, and the Adaptive suspension setup.
These changes are specific to the global version of the 4 Series, with news regarding the US version to be expected in the near future. Don't expect too many surprises.