Much like Nissan with its LEAF, BMW is strongly focused on marketing/advertising the i3.
This is evident in the series of videos BMW continues to release on the i3. This video focuses on the powertrain that makes the i3 go:
"Redefining urban mobility means thinking far beyond environmentally-conscious and agile driving. The result: with its visionary design, the BMW i3 design defines the automobile of tomorrow. Its innovative BMW eDrive power train was designed in the scope of the BMW EfficientDynamics technology and is not only locally emission-free, but also offers an incomparable and near-silent driving experience."