Biergarten in Epcot has a band that plays christmas music, little jingles and they get the kids involved when they tell stories of Christmas in Germany. Pretty cool stuff!
Also Usually the Characters @ the character meals will be wearing some sort of holiday apparel. At the least they will have holiday scarves. I'm not sure about what they do at O'hana as I've only ever done breakfast there but never around the holidays. When the Character breakfast at AK was in Restaurantosaurus the characters wore Holiday Sweaters but I haven't been to Tusker House so I don't know if they still dress the same way there. Not sure what they do with the Princesses for the holidays.
We did 3 character meals in 2013 in mid December (Garden Grill, Cape May, & Ohana). None of them had the characters in special holiday attire and none had any special decorations besides typical hotel Christmas decorations.
1) No.
2) The "theming" is at the parks and most resorts.
3) However, all eateries will have some minor "decorations".
. . . a tree
. . . some garland strings
. . . a few lights
4) Some of the characters at meals will have slight holiday trimmings, but not a themed costume.
Here's the info about Minnie's Holiday and Dine from Disney:
From November 7, 2015 through January 3, 2016,Hollywood & Vine could be the Happiest Place for Mirth! Celebrate the season with a gloriously festive dining experience—and a rare chance to see Mickey, Minnie, Donald, Daisy and Goofy all together (all-new costumes!) making merry with you and your Guests! Get hugs and photos with your happy hosts, and wonder as you wander through the dazzling décor, heartwarming music and holiday-themed food and activities
It's a brand new meal, so you won't find any reviews about it yet. It's also a very hard reservation to get now that they've been released for almost a week.
Edit to add that it's for dinner only, otherwise it's still the Disney Junior characters.
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