For those on the East Coast of the US (or willing to travel), just announced, Argentina v Brazil on the 9th of June!
I wonder if both teams will be close to full strength or not, but the article says the game falls on an official FIFA calendar date, so they may be. Should be great, even for a friendly. Then again, it's rarely 'friendly' between these two teams, they always want to beat each other even when it doesn't count. Considering my family is from Argentina, I'll be there for sure!
Here is the link: Argentina v Brazil