So, it’s just a test, but KLM will be testing a draft beer dispenser on a galley cart. The idea is to roll the cart down the aisle of the KLM aircraft and dispense beer along the way.
http://laptoptravel.blogspot.com/2016/07/klm-royal-dutch-airlines-and-heineken.html
There are some technical challenges, let’s hope they can sort them out.