2018 didn't have many updates, but there are quite a few for 2019:
There are more alcohol vendor booths, one for each Allied Race faction. There is also a water elemental, Hydratius, selling refreshing water.
Brewfest has more scenery including a set of outhouses with a long line.
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Source: Brewfest 2019 Holiday Updates and Guide (https://www.wowhead.com/news=295223/brewfest-2019-holiday-updates-and-guide)