That might be worth it. It's up to you.
Anyway, right now there's no indication that Blizzard has changed the holiday in any substantive manner, and [the developers said very recently at Gamescom](http://www.mmo-champion.com/content/1345) that there aren't any plans to overhaul holidays in the near future.
This year, Brewfest runs from Friday, Sept. 20 to Sunday, Oct. 6. As always, check your in-game calendar for your server's exact start and end times, as they'll differ slightly by time zone. The Brewfest meta Brewmaster is required for the year-long What A Long, Strange Trip It's Been, so you'll want to get this done if you're working toward a Violet Proto-Drake.
If you're leveling a monk who plans to tank, the Brewmaster title is basically mandatory. And yes, the Orgrimmar Brewfest area is smack in the middle of what's canonically a war zone at present, but when has free booze not trumped violence?