David Heyman confirmed the wedding will take place at the Burrow when I interviewed him.
Quote:
SS: Since Deathly Hallows is the first time we see Bill Weasley, how will he be introduced?
Heyman: Well, we know it's his wedding. So, he's introduced at his wedding and we express it's Bill and Fleur's wedding so you know it's Bill Weasley and it's at the Weasley house. So you know pretty much who he is when you see him and Fleur. It's pretty clear in the end.
You can read the entire interview
here.