UPDATE:
2012: Kansas City, Kauffman Stadium, already determined.
2013: New York Mets, Citi Field (new ballpark).
2014: Minnesota Twins, Target Field (new ballpark, no ASG since the '60s).
2015: Washington Nationals, Nationals Park (great ballpark, needs attention. Not Cubs, because more teams deserve it before them, and, sorry, they don't have a new/unforeseen ballpark).
2016: New York Yankees, [New] Yankee Stadium (fine, give it to the Yankees and their over-sized, superfluous ballpark).
2017: Florida Marlins, Marlins Ballpark (brand new ballpark, also the 20th anniversary of their World Series win over Cleveland. For real this time
).
2018: Tampa Bay Rays, Tropicana Field/new ballpark/ (the Rays are gonna have to get an All-Star game, new stadium or not. They may not even be in Tampa by the time this game is played).
2019: Cincinnati Reds, Great American Ballpark (see Nationals).
2020: Oakland Athletics, O.co Coliseum, or whatever the hell it's called/new ballpark (see Rays. And I doubt that piece of shit they currently play baseball in will make it to 2020, so this game could be played in Portland, Fresno, San Jose, Mars, or who knows where).
2021: San Diego Padres, Petco Park (see Nationals and Reds).
2022: Toronto Blue Jays, Rogers Centre (who knows, they might even have a new home by then).
2023: Philadelphia Phillies, Citizens Bank Park (see Washington, Cincinnati, and San Diego).
2024: Baltimore Orioles, Camden Yards (they're next in line for the AL, having last had an ASG in 1993).
2025: Chicago Cubs, Wrigley Field (sure, the Cubs can have the All-Star Game. In 14 years on the 80th anniversary of their last WS. But maybe they will have won a WS by then. On second thought, naw!)
2026: I'll be too old to care. Probably an AL expansion team at this point, if that team wouldn't have gotten an ASG earlier (2022 or 2024).
2027: Meteorite destroys Earth.
But, seriously, it would be the Los Angeles Dodgers (Dodger Stadium/new ballpark by this point).
This whole AL-NL alternating thing is really obnoxious (yet realistic and kind of sensible) because their are many more NL ballparks due for their first ASGs than the AL ballparks.