The Braves kind of pride themselves in being a classic-traditional franchise with a touch of modern taste.
I hope the ballpark concepts will make it look retro, with modern touches. I don't want it to look outrageous like a Marlins Park, Citi Field, or bland like Nationals Park. Like Okie said, the Camden/Arlington look, looks pretty nice and it'd be useful since the Atlanta skyline is no longer in play. They should be able to make it look much prettier with 10k less capacity. New Yankee Stadium still kind of has a classic look to it, despite the fact it looks really not that much like Old Yankee Stadium.
I'd imagine the Braves may even try to go back for the Biggest HD scoreboard record they had before other stadiums eclipsed theirs. It'd be tough to topple the Jerrytron in Dallas, but if Schuerholz says this is gonna be a marvelous new facility, I wouldn't put it past them to try it.
There's no reason to have the world's biggest jumbotron. That money could be much better allocated elsewhere.
To me the biggest keys to a successful stadium is
1. Access. Parking and Public Transportation. Obviously the latter is potentially the biggest issue for the Braves. I've spent a lot of time at both Citizen's Bank Park and Camden Yards, both are great at handling both of those situations from what I've heard (we walked to the Orioles games though I just chatted up a few fans)
2. Food. Turner field seemed to finally be moving in that direction. Ballpark staples of hotdogs, peanuts, fries, popcorn, and ice cream are fine and dandy but the most successful ball parks have that and add in local food as well. I think the additions of Waffle House, Holeman & Finch, etc. But I think they can kick it up just a little more as well. Another thing that both CBP and Camden Yards have and does well is basically an area for Food and Beverage. Rather than trying to hunt down where something awesome is, most unique eats in Philly are in Ashburn Alley. (Cox COrridor anyone?) where you'll find TOny Luke's, Campo's and Chickie and Pete's and other things of course. The key is blending that type of place with cool places elsewhere for people who don't want to wait in large crowds.
3. Beer. can't vouch on how many beers from each brewer but these were the craft beers on tap at Turner Abita Brewing Company, Samuel Adams, Sierra Nevada Brewing Company, Sweetwater Brewing Company. That's freaking pathetic. Compare it to a park that's generally regarded as the best if not one of the best in the nation in PNC Park 21st Amendment Brewery, Brooklyn Brewery, Church Brew Works, Dogfish Head Craft Brewed Ales, East End Brewing Company, Erie Brewing Co., Flying Dog Brewing Company, Harpoon Brewery, Lagunitas Brewing Co., Pennsylvania Brewing Co., Samuel Adams, Sierra Nevada Brewing Company, Stone Brewing Co., Tröegs Brewing Company Now I know that availability because of shipping is an issue. and of course beer sselection alone doesn't make a great park. But some Breweries I know distribute to the Atlanta area that I've found with minimal research. Allagash, Boulder, Boulevard, Dogfish Head, Founders, Great Divide, Green Flash, New Holland, and Victory. Any one of those would be a catch. At the absolute minimum. Add Terrapin and Red Brick to up your Georgia presence. It does vary market to market but based on what I've read Atlanta is a market on the rise (or already great I forget) for craft beer. So give fans some choice at the stadiums. Obviously BMC will sell the best at the stadium as it does in real like but better food and beverage options are a must for return customers.
4. Seating. The magic number seems to be in about the 40K area.
5. Things for the kids. Pretty wide grouping here but keeping kids entertained and not whining to their parents is huge. So giftshops, games, etc. are all musts.
There are most things but those things pop out as things that certainly help. Some charm that some stadiums have cannot be replicated, like the Green Monster, the stadiums built on Rivers, etc. So you shouldn't overly focus on that an instead focus on the overall fan experience.