As far as i know:
LEDs have been put everywhere, seen this on the display model at Auto Glen...WOW!
New rim designs as well (one of which i have on my car already lol)
The color of the internal climate control display like above
The Headlights & taillights have new design
the cupholder lid and the layout for the mini cubby above the gear lever
twin tailpipes on the 320i models and upwards
the suspension has been tweaked in a number of ways
The 320d has 140w/400nm engine...(Apparently this file has been floating around on the late 2014 & 2015 models already)
i got this high level list on the net also:
Exterior
New halogen headlight design with LED daytime running lights
Full LED headlights now an option (standard on 340i)
Headlights have moved further apart
Daytime running lights feature upper and lower edge of LED light tubes with LED bar connecting to kidney grille
Optional Adaptive Full LED Headlights with Auto High-Beam System
Broader side air intakes in front apron
New, more intricate styling of central air intake
New full LED tail lights
LED brake lights
Interior
Center console now comes in high-gloss black
New ambient lighting
New chrome accents - seat adjustments, window controls, air vents
Trim finisher in instrument panel expands into all four doors
Cupholders now have sliding cover
New Colors
Mediterranean Blue Metallic
Platinum Silver Metallic
Jabot Brown Metallic