I know this isn't relevant to many of our foreign readers, but it is something I think those on this side of the ocean will appreciate.
As I'm sure you (may or may not) know, yesterday was the Fourth of July, aka Independence Day, aka "the day to explode things and watch Will Smith punch evil alien invaders in the face" day. Seeing as how this is "Murica," as Jason put it yesterday, it's a day all about national pride (while punching aliens).
Anyway, Wizards of the Coast decided to get in the game, and as a result we get this:
I think this mostly underlines just how awesome the community team at WOTC is. They're great at doing creative things like this to build goodwill among the player base.
Unless you live outside of the United States anyway. Then I guess you hope they remember come your national holiday.