I received a notice on the 2014 B Class that I turned in this past October when I drove out with the leased 2017 B250e. Strangely, have not received a recall notice for the B250e yet.
The notice was to inform that there was a potential problem with the grounding for the airbag mechanism and that I would be contacted by my dealer when they received the replacement parts. This affected per google multiple Mercedes cars and has nothing to do with our electric drive.
Search the internet for more details if you have not received the notice.